NOT A TEACHER
"Suggest" is a transitive verb because it requires an object. You cannot just suggest. You have to suggest something. Suggest can be, but doesn't have to be, followed by "that". For example: I suggest you call him first. You can also write: I suggest that you call him first. In both cases you suggest something.
I hope this answers your question.
(In addition I would also like to point out that there is no reason to capitalise every letter of the thread title.)
Student or Learner