Can you explain why it is not advisable to invest early and not trade too fast?
I think OP wants to explain that Newbie is lack of knowledge and experience. Newbie also probably has a weak mentality and understanding about crypto market. So, it is too risky if a newbie invest or trade immediately. Newbie must focus on learning first and get some experience through some sources. If the newbie already has sufficient knowledge and experience, he/she can start to invest or trade crypto.
-snip- what if Newbie Investors want to invest and trade in Bitcoin, is this step also not recommended.?
If the newbie already has enough knowledge and understand well crypto market, he/she can start invest/trade with small amount of money. But if the newbie still has lack of knowledge and experience, it is better to focus on learning first.
Newbie, immediately invest and trade as soon as possible in Bitcoin while the price is undergoing a correction.
OP is discussing about crypto, not only Bitcoin. Even if investing in Bitcoin is quite secure, we still need to have knowledge to make it effectively. Never invest in Bitcoin or altcoins without having good knowledge about them!!
If I did not invest early as a beginner, then what should I do first?
The first thing to do is focusing on learning!!
Investing and trading require knowledge, it is not as easy as we assume.