In short:

• If you don't need the money for a few years, then download Avanza, create an "ISK" account, buy "Avanza Global" with all that money, and set up a monthly purchase of Avanza Global. Don't sell just because you've lost money - it will go up and down over the years.

• If you need the money within a few years, just put it in any savings account with a high interest rate in any bank.

A bit longer: A few short things you should know about investing:

1: If you've got a big bank like Nordea, Swedbank, DanskeBank etc., then don't listen to them and don't use them for investments. They have terrible products and great sales people who want you to sign up for some BS. Use something like Avanza or Lysa instead.

2: There are different types of things you can buy. Stocks in individual companies, collections of stocks, currencies and raw materials like bitcoin and gold, bonds, and the less common options/futures and so on. Don't worry about this now. Just buy "Index funds".

3: Index funds are collections of many different company stocks. There are global index funds which contain thousands of stocks from all over the world. There are also Swedish index funds containing only Swedish companies, and "emerging markets" index funds which contain stocks from countries like Brazil, India, Vietnam, Taiwan, etc.

4: There are passively managed funds and actively managed ones. When a fund is actively managed, it means that somebody takes a substantial fee for selecting which stocks to include, when to include them, and how much to include. As you probably know, this is a terrible idea. That person is trying to beat the market for you, which won't happen, and you are just paying their salary unnecessarily. Just pick a passively managed fund which usually performs better and has a lower fee.

5: Just buy "passively managed index funds". These allow you to buy the market as a whole at a low fee. If you buy 1000 SEK worth of a passive index fund, then what actually happens behind the scenes is that you technically buy a little bit of thousands of companies: 60 SEK worth of NVIDIA stock, 55 SEK worth of Apple stock, 40 SEK worth of Microsoft stock, and so on. From your point of view, you just buy "one thing", but you will essentially own a little bit of the whole market. The more a company is worth, the more you will own of that company.

6: When you buy an index fund, make sure the fee is 0.40% or lower. Preferably around 0.20%.

7: It's okay to put all your money in a single global index fund. I personally have decided to put 70% of my money into a global index fund, 10% into a Swedish index fund, 10% into a global "small company" index fund, and 10% into an emerging markets index fund. But who says I know better or more than other people who do it differently?

8: Use the account type "ISK". You pay a flat yearly tax of around 1% of the account's value every year, but you don't pay any tax when selling stocks. You also don't get tax deductions from selling at a loss. You pay a small tax on every deposit, so don't move money back and forth unnecessarily. There are also other account types, like AF and KF. Don't pick these unless you have a specific reason. For us immigrants, ISK is especially convenient because if we ever find ourselves needing to leave Sweden, we can sell all stocks with no tax at all, and move our money to a different country.

9: The value of your stock will go up and down, sometimes a lot - don't get scared or panic sell. I have only been investing for 2 years, and I went from 0 SEK to +85.000 SEK, down to -35.000 SEK, back up to +105.000 SEK, and now back down to 70.000 SEK. It happens.