I like this. I like it. . "this" contrasts with "that". It means something here, rather than there. "it" is the general pronoun for a gender-neutral third person object, something already under discussion. . Chocolate? I like it. Generic Hmm this is chocolate. I like it. (neutral, not stressing that the sunday is near you) Your strawberry sunday looks good, but I like this, my chocolate one. (Emphasises the one you have, right here, rather than other types, or others further away,) Your strawberry sunday looks good. This chocolate sunday is ok, but I'd like to try that. . Any better? I've tried to make things clearer. Did it work for you? Did this work for you?

I think that "this" is used for say "that, there or indicate something" and "It" is used like as subject of type "animals, something, or hide subjects". Example: I know you and this is important for me. I know my dog, It is so smart.

"This" means that it is right here, in front of you (not over there, far away). While "it" means that it is neither he nor she, but an it.

"People talk about (it). a lot of strange things are said about (this)."

Sorry, in general they are just different. Do you have some context?