@harpazo,
How close are you to retirement? That will help to define how much risk you can tolerate.
For example (since you're talking about 10 years of employment, I am going to assume you are at least 30 years old), a 30 year old will be able to risk more because retirement isn't right around the corner. There's time to make it up. Plus there's time to put in a lot more with your contributions.
A person twice that age has a much narrower margin of error when it comes to risking principal.
Put $1000 in at age 30 and add $100 each month, with 2% annual interest and 35 years of contributions (monthly compounding) gets you $62,868.62 at the end.
With the identical scenario but you start at age 40 (same end date, when you hit age 65), you get $40,594.92.
Start at age 50, same scenario, etc., and you get $22,355.78.
Start at age 60, and you get $7,420.32 -- which is still nothing to sneeze at. See:
https://www.thecalculatorsite.com/finance/calculators/compoundinterestcalculator.php#targetText=Compound%20interest%2C%20or%20'interest%20on,for%20principal%20and%20compound%20interest and plug in whatever numbers you like.
Of course numbers go up and down. You get a raise, then hopefully you put in more (you should!). Or maybe you put in less because of some sort of emergency requiring a lot of cash quickly. In the US, that can be medical bills. But anywhere in the world, your house could burn down (insurance only covers so much), you could total your car, etc.
The above is also assuming you don't interrupt your contributions. But if you lose your job, then an interruption could happen.
Best way to understand stocks (I am not a stockbroker, etc. -- I work in business credit) is to read not just the business section but the national and international news, too. Fires in the Amazon rainforest can affect the price of all sorts of things. So can war in Yemen or a tsunami hitting Japan, etc.
Do you have a good relationship with the place where you do your banking? If you do, then maybe invest with them, at least a little, and see what kind of advice comes with the territory. For some banks (Bank of America I know does this), if you keep a certain high balance, you're entitled to all sorts of financial help, maybe even with understanding tax implications. It pays (quite literally) to ask.
Your local college or adult education place might offer courses in financial literacy. And there are always books, so talk to your local librarian and see what s/he recommends.