How do you say "by" in French as in "What do you mean by that" do you use the word "Par""par"?
Also a bit out of topic, how do you say "It can improve your memory a lot" do you use "un beaucoup"? Because it doesn't sound right as "Il peut améliorer ton mémoire un beaucoup". But it sounds better as "Il peut améliorer un beaucoup de ton mémoire" but that's litteraly "It can improve a lot of your memory"
Thanks!