I do a lot more research about the project before I invest in it, and will only buy the bottom of a good project. That's how I minimize losses. When I first started out, I invested in a lot of scam projects that stole my money, and I FOMO'ed into shitcoins and panic sold the dips. I've learned a lot since then.
I guess you have misunderstood what the OP means about handling losses in trading.
Investing in a certain project and holding their token is different from trading alts in the market. Of course when you're trading you don't want to buy shitcoin just to rot inside your wallet.
Losses are inevitable when trading. Experience will give you tip on how to minimize and handle your losses. You basically just need to be patient, learn from mistakes and be very observant on TA's.