To my knowledge the top 3 things to bear in mind are, cover your basics, don't invest more than you can afford and set yourself a deadline for when you're going to stop day trading and asses how it all went. Also, can use tools but I wouldn't recommend them at the beginning, give yourself some time before you use them as you'll need to first understand how they operate.
There are thousands of newbies entering cryptocurrency trading daily but more than half of such newbies might be leaving the markets in a single day. Trading is a trickiest source of investment but yet can give us major profits so you should always try to gain as much knowledge as possible before actually performing your first trade.