Basic advice: it all depends on your time horizon. If it is 20-30 years (i.e. you won’t touch it and you’ll let it grow that long) then buy index or mutual funds and reinvest the dividends (eg Vanguard has low cost ones). Contribute to it every month. Let it grow. The rule of 72 can be useful. Basically you divide 72 by the interest/dividend/growth rate. So if your money grows 10% per year, your money will double every 7.2 years. Etc.
Don’t look at it every day. Ignore price swings. Don’t watch CNBC (all the headlines are for day and swing traders).
There are free growth calculators online that u can use to model your future stash.
Live and enjoy life. Use your money to also have a lil fun along the way.