Since you are a beginner, start by investing in companies in the top 50 in your nation.
Pick the index of your nation, it could be NASDAQ, NSE, etc.
Invest in the top 50 companies and this is a great way to start safe and make decent returns.
With the right entry these can even give good enough profit with significantly lower risk.
Newbie or beginner should be getting used with low risk stock first and don't recklessly bet on volatile stocks just to get the gist of it.
S&P500 were giving good returns before it reached ATH and getting some correction despite the low risk. for stocks like these, entry and long term holding matters more.