Title Animation within Envato Elements?

Hello, I wanted to buy a Title Animation Pack for a project.
What is included when I buy Envato Elements?
I mean, is EVERY Title Animation Pack included in these monthly/annuary license…?
Please help! I do not understand the difference between buying/licensing once and the elements subscription.
Another question: When I buy a Title Animation Pack with regular license there are lots of DIFFERENT animation within. Is it ok to use DIFFERENT animations in DIFFERENT projects and sell the end product? I’m a freelancer. Thank you