Yes, there are million of retail traders/investors created during the Covid boom with the help of platform like Robinhood.
For a more complex strategies, people don't usually trade solo since the capital and research involved to generate idea, backtest, execute in enormous.
There are plenty of platforms that will allow you to test your idea and strategies. One is QuantConnect.
They have discord channels that you can share your idea with.
I would start by learning coding in
Python/
C++ and learn how to work with databases such as SQL, etc.