Giving advice can be accomplished with one or two simple phrases:
You should (not)...
Why don't you...?
"You should study English every day."
"You shouldn't eat too much chocolate."
"You should call the client to make sure they have everything they need."
'Why don't you go home and get some rest?"
"Why don't you get a second job so that you can make some extra money?"
"Why don't you stop complaining and do something?"