Get to know the blue chips, decide to buy those in a business...

Get to know the blue chips, decide to buy those in a business you understand but wait for a sell off then buy. It will be difficult because you will be spooked by the sell off. Look at the range of prices, note how stocks trade in a range.

Be patient.

After you have accumulated a reasonable portfolio then allow yourself to gamble a small portion, say 5%, of value of portfolio, be prepared to lose it, if you cannot do that do not go near penny stocks. You will lose lots in penny stocks with the very occasional possibility of a winner.

Never fall in love with a stock, you can lose lots that way.

Just my thoughts over decades of investing.