Buy shares that offer a dividend reinvestment plan so when you get a dividend it can go into new shares where you don't have to pay brokerage. Plus you get the capital growth as well. Invest large enough sums of money so that any profit outstrips the brokerage fees. Look at learning to trade other instruments where brokerage in low, like forex for example. You can learn Forex on a free demo account for a year or so until you've figured out your strategy. Don't trade real money first up as you will likely lose the lot.
I'm sure some of the older hands will have other ideas.
What is your goal here? We all want to get rich by next week, not too many manage to make it happen.
(This is just my opinion only, I am not a financial adviser and have no qualifications in that regard. Do your own research before investing in anything. )
