You buy a whole ton of tokens. Basically, You over-buy up the supply, then put another couple massive buy orders higher than where you bought said tokens.
Hopefully, bots or other users will increase there buy orders above yours = Price PUMP.
Then you slowly sell at profit until you deplete your supply
Remove buy walls = Price DUMP
It's risky, because you can find yourself stuck with a massive supply of shit tokens that no-body, not even bots, wants to buy
It's probably the best, and easiest way to burn yourself. Search for better options