How to buy at the bottom correctly?

First, make sure you have room for maneuver, because can you really be sure that you have bought at the bottom or halfway up the mountain?

I have always emphasized buying at the bottom in batches, at least to ensure that when it falls, you still have enough room to support your ability to continue buying at the bottom.

Unless you are 100% sure that you have reached the bottom, and then leave the normal living expenses, and go all in, I can accept it. After all, go all in, and don't care about life and death.

But the key issue is that everything is speculation, so don't be so "decisive", after all, life is not a game, you can go in reverse.