'Yes, and "just" can also have other meanings:

1. That's just (exactly) what I wanted 

2. My team just won = my team won by a very small margin (also, depending on the context, my team won its match only a short while ago)

That car just missed hitting me (by a small margin)

3. Mozart was just (only/merely) a boy when he wrote his first concerto

4. Your jacket is just (really) magnificent

''JUST''

Yes, you can use it as in "just now" (something just happened) or to mean fair (something was not just.) Some people use it when it is not necessary, for example, "I just didn't feel like it," or, "I just ate one piece of candy, Mom!" In that sense, it is kind of like an excuse and doesn't really have a lot of meaning.