One important bit is how the guy working in investments keep his money in ETF. I was lucky enough to work in the Silicon Valley 10 years ago and have colleagues that knew about ETF and explained them to me. It took me still 8 more years to understand fully what they are and open an investment account and buy one. ETF are quite well-known in the US but scarcely known in Europe, at least in my social circles.
Most of the people I know in Europe doesn't know about ETF and only invest in it's mortgage of the house where s/he lives. They only know about Real Estate and as soon as you speak about ETF they think you are preaching some get-reach-money-scheme and they ask you stuff like:"Ah so I should buy a lot of gold OR bitcoin?"...mmm...NO...do not buy a lot of gold and crypto...buy ETF which are diversified group of stocks to have a diversified investment.
FEW TIPS FOR WHO DOESN'T KNOW WHAT ETF ARE:
1) research passive investing with ETF
2) DO NOT TRY TO BEAT THE MARKET: The chances you are the smartest person on the planet and have incredible financial ideas that no-one else had are practically 0 and even financial geniuses get it worse than just buying a little bit of everything after a couple of years.
3) BUT Warren Buffet did it! Warren Buffet is not just an investor. He's a business man, he got down in trenches many times to save up companies. He created value as war-time temporary CEO.
4) do not invest with Robinhood/Etoro, get a investment bank that has been around 10-30 years but not a dinousaur. https://www.interactivebrokers.co.uk/ is available in many countries.
5) Start by buying only one ETF of a very generic market index with the lowest fees. For example MSCI World.
6) Do not buy ETF of niche sectors because they are just not diversified and you might as well just buy stocks and gamble.
7) Do not try to time the market. Just keep the ETF and instead of wasting time buying/selling stocks spend time working as an employee or startup founder.
8) People that tell you that they make money daily-investing should be taken as serious as professional poker player (to be clear both daily-investing and poker playing are NOT profession but just pure gambling and luck. The Casino always wins in the long run. Find something you love that creates value and do that.).