I suggest that you don't go in to trading immediately. As you said you wouldn't want to have an initial investment, so how would you trade with no funds? Start by studying about crypto in general, then go in to bounties and airdrops to get your initial funds.
This is the very best advice if you are starting out in crypto. Come on mate, become a person who loves to read a lot, become a widereader and be a kind of person who is very curious in all things especially in crypto, these are the best way to diversify your knowledge and become ready to join some bounties to get your initial funds.
If I were you, I will explore the forum and read lots of article now to become ready, you dont want get scolded by higher ranks because you are a shitposter, spamming every thread to earn some pennies.