When do I use a semicolon?

Semicolons are used t join two or more ideas in a sentence. Use a semicolon between two independent clauses that are connected by conductive adverbs or transitional phrases.

How do I improve my accent to become more intelligible?

Learn and listen, focus on mouth placement and where to place stresses on sounds. Practice, don't be afraid to seek extra help or ask for pronunciation help.

Is there a difference between "going to" and will"?

Yes, in American English, there are many rules pertaining to grammar. If a prediction on the future is being made, such as: "Watch out! You're going to slip on the puddle on the floor" Then "going to" is used, because the future has a connection to the present. "will" is used when there is no implicit or explicit connection to the present, or to make an offer, promise or threat. for example: "I'll buy two coffees, one for me, and one for my friend" "I'll tell your mom the next time you tease me."