"This session or class is very informative it's worth attending."
Is that your attempt to follow my suggestion in post #5?
Did you even read post #2?
Tufguy, I think you need a couple of days' rest. Your recent posts have been rather poor and you have been failing to read/understand/follow our advice in multiple posts.
"This session is very informative, it's worth attending."
"This class is very informative, it's worth attending."
Thanks for writing separate texts for each of the two words you're considering. Now you need to divide each of your texts into two sentences. They contain comma splices. Google comma splice and read about what they are, how to recognize one, and how to correct them.