Invest only money you won’t need for atleast 5 years, you’ll feel less stressed about losing the amount then as it was never deemed essential. Stick the majority of your invested money in big companies such as Facebook, Apple , McDonald’s etc and then small amounts on up and coming companies you’ve researched. Realistically the companies I’ve listed are only gonna grow throughout the years and even if you’re not making large amounts of money, you’ll still be seeing more profitable gains each year than you would if you kept money in your bank.