Alan discusses the differences between words that sound similar but are wholly different in their meaning. The examples presented in the video are 1) apart vs. a part, 2) a lot vs. allot, and 3) every day vs. everyday.
Do you use words like these: I’m, you’d, she’ll, who’s, didn’t, won’t, they’ve, we’re? If so, you're using contractions. This is a very normal way of speaking American English. Alan tells why and gives examples.