Hi
all of these words are suitable to use
-when you meet someone in a quite formal context, you can say "it's a pleasure meeting you"or "the pleasure is mine"...
-when you're happy about something, about good news, when you're having a good time, in daily life you would say
"I am glad to hear that everything is going fine after her accident"
"I am happy to be with my family to celebrate Xmas"
- "enjoy"is often used
"I really enjoyed my biology classes this semester" means you like and appreciate this class
"I really enjoyed the party" means you had a good time
" I enjoy going to movies" means you like going to movies
- delight may be more formal
"I would be delighted to meet you at your convenience" can be used in an application letter for a job, for example
hope that helps!