When you use something that's available to you, you "take advantage of" it. For example, if you live in an exciting city but stay at home every day, a friend might tell you:
You should take advantage of everything the city has to offer!
This means that there are interesting things to do in the city, so you should use them.
A common mistake is for English learners to say "take the advantage of ___". You shouldn't use "a" or "the".