Alot is not a word. The confusion comes because people use a lot (meaning much) when a more precise word would serve better.
Students must study over a semester or two (not a lot) to pass the AP test.

altar = an elevated place for a religious ceremony
alter = to change or modify

Use bad, not badly, after the verb “feel.” So, it is not correct to say, “I feel badly about what I did.” It is, as if, one is saying that he has an inferior sense of feel (is a bad “feeler”). Besides, “bad” is the adjective, and “badly” is the adverb. “Feel” is a linking verb, meaning that it takes a predicate adjective. Therefore, one must use “bad” after the verb “to feel.” I love being the grammar goddess!!!

continual = repeat on a regular basis
continuous = uninterrupted or not stop

Use toward, not towards when writing.

stationary = not moving; fixed in place
stationery = writing paper

sometime = at some unspecified time
some time = an unspecified quantity of time
She hopes to start a writing career sometime before she retires.
However, she must spend some time brushing up on her grammar beforehand.

premier = the leader (He became the premier at a young age.)
premiere = first performance

figuratively = symbolically (Similes and metaphors are used to speak figuratively.)
literally = actually; exactly

each other = used for two people, places or things
one another = when three or more are involved