직접 = personally, in person

내가 그를 직접 만나 보겠다 = I am going to meet him in person.
이 목걸이는 그녀가 직접 만든 것이다 = She made this necklace by herself.
직접 봐라 = Take a look for yourself.
직접 해 보시겠습니까? = Would you like to try it yourself? 

본인 = oneself, own (more official/formal)

통장을 만들려면 본인이 직접 은행에 가야 한다 = You need to apply in person if you want to open a bank account.

본인 내담 요망 = Apply in person.
본인 소개를 해 주세요 = Could you introduce yourself? 

회 = episode, instalment (of various things) 

제’57회 베를린 국제영화제 = the 57th Berlin International Film Festival
회의는 연 2회 열린다 = The meeting is to be held twice a year.
그 드라마는 회를 거듭할수록 흥미진진해졌다 = With each episode, the TV soap opera was getting more interesting.

화 = episode, instalment (only tv, webtoons, radio shows etc) 

1화, 2화, 3화

School starts
입학하다 = join/enrol in a/start at school
개학하다 = school starts, start of the semester (below uni)
개강하다 = school starts, start of classes (in uni)