You can set up stop-loss anytime you do want which is mostly 5-10% below on your purchased or buypoint. I havent tried coinbase pro if they do have  SL tool but i can give you out

some tuts on how its been done but this time it on Binance. You can check it out here https://www.binance.com/en/support/articles/360040016512#:~:text=How%20can%20we%20help%20you%3F&text=02%2021%3A26-,The%20stop%20order%20on%20Binance%20Futures%20platform%20is%20a%20combination,when%20the%20order%20is%20placed.

As a beginner or do make active trades then this tool is always been suggested to be used up.