Correcting?

Ok moms and/or dads what age did you find appropriate to start correcting your child and how did you do it?

Here is my thing my son is about to be one in two weeks but he is incredibly smart he understands way more than people give him credit for but he is still a baby I know that and he doesn't understand right from wrong but I have started slightly correcting him I started months ago I mean when I tell him something like stop or no or anything like that he does it so when he grabbing things like the trash can or something and I tell him stop and he keeps doing it I will lightly pop his hand and tell him to not do it and some people seem to think I'm being a bad mom because I pop his hand and tell him no they say he is to young to be corrected.

So what do y'all think? am I wrong?