This site offers free courses and video tutorials in ALL subjects! It also offers SAT, college, career, and buisiness, and growth mindset tools.
With over 7,000 videos in 13 different subjects to help you with your homework questions, finding answers should be a walk in the park (not the jungle) on Hippo campus.
In the left column, scroll to the "Grammar Basics" link. You will find video lessons on various topics from independent clauses (ie. complete sentences), to colons and semi colons, to who v. whom, etc.