I think that the most difficult thing is to feel the market. This skill is a combination of books,  youtube videos, communication w other traders and your own experience. It takes a lot of your time..
But to minimize loss, then study and learn how to trade. Learn the chart. For crypto trading, learn Tech analysis, fundamental analysis and sentiment analysis. You can start by learning first how volatile crypto then learn all the trading signals so you can read and understand chart and learn how crypto move and what makes it go up and down. For beginner, it's ideal to start small while you're learning then invest little by little as you learn.

Also I can recommend you try to use the trading bots in parallel. It can be good experience for you. Just divide the part of the coins for trading manually, and part for the bot. You can to learn and earn at one time. For this using I recommend you https://tradesanta.com/en. It's easy and works well.