First, do I need to study different technical analysis? Will it be helpful once I'm into trading cryptocurrency?
Yes, but extent is the question here. The best way to learn is by trying and immersing yourself. Technical analysis works
sometimes but IMO only because so many traders follow them; they end up being self-fulfilling prophecies. Some level of familiarity would probably suffice. Focus on them too much and you could end up seeing patterns where there are none.
Second, do you know some famous crypto fanatics whose giving some good tips about crypto trading which I can follow and learn from?
It's probably better to not trust anyone, since crypto is mostly unpredictable anyway. If you do end up following a couple of people though, make sure you do proper research on them. There are a lot of shills out there.
Lastly, what do you think are the good coins now to look forward to. I can see on the chart that there are lots of new coins in the top compared to what I knew way back few years ago.
Everything rises and falls with Bitcoin, to the point where diversification
within the crypto market is nearly meaningless. You might be able to catch surges here and there with alts, but catching those is mostly blind luck and pullbacks can be bloody. If you're just starting out with trading, I suggest you start with just Bitcoin while keeping your eyes on alts, and then you can jump in once you're comfortable.