3 things to write well.
1. Topic sentence at first. You should let Readers know what you wanna tell them.
2. Supporting sentences. You should provide as much evidence to Support your Topic Sentence.
3. Concluding sentence. Of Course you should sum up everything you wanna tell, otherwise Readers will Forget them all.
Sample:
OF is my favourite Forum. (Okie, this is the Topic sentence. Next, we should give some reasons to prove it, those are called suporting sentences.)
I love it because of three reasons. First, blah blah. Second, blah blah. Third, blah blah. (Almost done. But now we should summerize what we said above. That's called Concluding sentence.)
In short, OF is where we can find good friends, and share any Thing we want.... blah blah...