Some people say not to trim at all, and some like to really trim their plants,
there's big debates about that. I like to trim a little in late veg, just once, mostly the older leaves
and some just to let more air and light into your plant. In late flower I try and remove all
leaves with a long stem and some of the older leaves that are a bit discoloured. Again this let's more air and light
in and the chances of mold or mildew on your plants goes way down. I've had great success growing this way..
Hope this helps๐..