See above.Please answer my following questions.
1. Sometimes I see some people using "all the time" and other people using "all the times"? Which one is correct?
I can't think of a situation where "all the times" would be correct. Unless someone else can think of a context for that, then I recommend you use "all the time".
2. When I tell people that I have "a couple of" things. People would think that I only have "2" things. But I actually mean "a few of" things. What does "a couple of" actually mean? Does it also mean "a few", "several"?
"A couple" means two. It is frequently misused, for example "I'll be there in a couple of minutes" rarely turns out to be only two minutes so it can be used to express "some" or "a few" but it shouldn't be. If you're talking about something easily countable, then it would have to mean two: I have a couple of pencils = I have two pencils.
Student or Learner