Most beginners get stuck in the same place. They understand that a broad stock fund can grow money over many years, and that costs matter. They still do not know which app to open or what happens after they press buy.

That is what this article is for. You need two different things to invest. One is a fund (often an ETF): a ready-made basket of stocks or bonds. The other is a brokerage account: the account at a bank or broker where you hold cash, place the order, and see the position afterward. Harust helps with understanding funds and portfolios. The brokerage account is where the money actually moves.

What happens when you buy a fund

Suppose you want a world stock ETF. You do not email the fund company with a card number. You open a brokerage account, transfer money from your everyday bank, find the ETF in the broker’s search box (by name or by its ISIN code, a unique identifier printed on the factsheet), and submit an order for a number of shares or units, or for a cash amount.

While the order is open, that money is still cash in the brokerage account. When the order fills, the cash drops and a new line appears: the fund name, how many shares or units, and a market value. From then on that line is part of your portfolio. If the companies inside the fund rise or fall, the value of the line moves with them.

The broker and the fund company are different firms. The broker runs your account and routes the trade to the exchange. The fund company runs the pool of investments inside the ETF. You care about both: the broker for fees and whether you can access the fund at all, the fund for what you own and what it costs each year.

Apps are just the interface. Banking apps with an invest tab, dedicated broker apps, and newer phone-first brokers all do this same job if they offer a real brokerage account.

Order types, in plain terms

During exchange hours you will usually see market and limit orders.

A market order says: buy or sell at whatever the current price is. It is simple. On a large, heavily traded ETF the price you get is usually very close to what you saw on screen.

A limit order says: buy only at this price or better. If the market never reaches your price, the order sits there unfilled. Useful when you care about not overpaying; annoying if you expected an instant fill and did not get one.

There is also the spread: the gap between the price buyers are offering and the price sellers are asking. On big ETFs that gap is tiny. On obscure ones it can be wide enough to notice. You pay that gap when you trade; it is not a line on an invoice, but it is real.

Some brokers let you buy fractions of a share. Others require whole shares. Some support a monthly standing order that buys the same fund automatically. None of that changes the basic idea: cash in, order, filled position.

Examples of brokers and apps

These are examples of well-known firms, listed in no particular order. Harust has no commercial relationship with any of them and does not rank them. Availability, fees and features differ by country and change often, and the short descriptions below may be out of date, so read each firm’s own pages before you decide. You only need one account to start.

Interactive Brokers (IBKR)

interactivebrokers.com. A large international broker. Wide ETF and market coverage, mobile and desktop. The tools are capable and can look busy the first week. They offer paper trading: a full practice account with fake money so you can learn search, order tickets, and fills before you fund a live account. Getting started videos: IBKR Campus lessons.

Trading 212

trading212.com. A retail app with a simple phone flow. Use the Invest account for real stocks and ETFs. They also offer other product types aimed at short term trading; if you only want long term funds, stay on Invest and ignore the rest. Practice mode is built into the app. Help centre: helpcentre.trading212.com.

DEGIRO

degiro.com. A European broker with access to a large set of ETFs. Commissions differ by exchange, so check its price list. The site and app are more traditional than flashy. Open the DEGIRO site for your country so you see local terms and pricing. Help: degiro.com/help.

Trade Republic

traderepublic.com. A mobile broker used across much of the EU. Straightforward ETF purchases and recurring buys. Check on their homepage whether they onboard residents of your country.

Charles Schwab

schwab.com. A major US broker: accounts, research, and a large education section with articles and videos if you are in their market. Learn hub: schwab.com/learn.

Fidelity

fidelity.com. Another major US broker with broad fund access and a detailed learning centre: fidelity.com/learning-center.

Vanguard

investor.vanguard.com. Vanguard runs many of the low cost index funds people buy, and also offers brokerage. Use the Vanguard investor site for your country; the exact domain differs by region.

If you are outside the countries these firms serve, look at banks and brokers licensed where you live that offer access to foreign exchanges. Many people simply use their local bank’s investment service or a local licensed broker. The account mechanics above are the same.

Before you open an account

Whichever firm you look at, check these first:

  • Is it licensed? Find the regulator that supervises it and confirm the firm’s name in that regulator’s public register.
  • Does it accept residents of your country? Rules on who can open an account differ by country.
  • What happens if the firm fails? Ask whether your investments are held separately from the firm’s own money, and whether an investor compensation scheme applies. Protection varies by country, and some places have none.
  • Which products does the account offer? Some brokers also sell leveraged or short-term products. For long-term funds you do not need them.
  • How are gains and dividends taxed where you live? Rules differ by country and by where the fund is registered.

Fees that show up at the broker

Fund costs (the TER or ongoing charge) come out of the fund every day and never appear as a separate bill. Broker costs are different and easy to miss until you add them up:

  • Trading commission: a fixed amount or a percentage each time you buy or sell.
  • Custody or inactivity fees: some brokers charge for holding positions or for leaving the account idle.
  • Currency conversion: if your salary is in one currency and the ETF trades in another, the broker’s FX rate is often where beginners lose more than they expect.

On a €100 monthly buy, a €5 flat commission is 5% of that contribution. On a €5,000 buy, the same €5 is negligible. Match the fee schedule to how you actually plan to invest. For the fund side of cost, read The cost you pay every year without seeing a bill.

Path from zero to a filled order

  • If you have not yet: build a cash cushion for emergencies, clear expensive consumer debt, and be honest about when you need the money (Before your first investment). Money you need in a year or two should not depend on the stock market recovering in time.
  • Choose one licensed broker that accepts your residency and shows the ETF universe you care about (for many beginners: broad world or regional stock ETFs, and optionally a bond ETF).
  • Watch one official walkthrough from that broker (IBKR Campus lessons, Trading 212’s help centre, Schwab Learn, and so on) so the screens are not a surprise.
  • Open the account and finish identity verification. Transfer an amount you can leave invested for years, not money for rent.
  • Find the ETF by name or ISIN. Place a market or limit order during market hours. Wait for the fill. Read the confirmation and the position on the statement.
  • Stop. One fund (or a simple stock plus bond pair) is enough for a first portfolio. Adding ten products in week one does not make you diversified in a useful way; it makes the statement harder to read.

Harust’s practice portfolio can show how a mix behaves with illustrative amounts before or alongside that, without connecting to the broker. Once real positions exist, the same ideas (mix, geographic focus, concentration, yearly fund cost) apply to what you actually hold.

Bottom line

Investing through an app means: brokerage account at a regulated broker, cash transfer in, order for a fund, filled position on the statement. The firms above are examples. Open one that is licensed and available where you live, learn its order ticket once, buy a fund you already understand, and treat the broker as plumbing. What you own inside the fund is the part that needs ongoing attention.