I've started learning UML but it confuses me sometimes (for example what i'm allowed or not to put in my USECASE diagram, last time i was wondering if logging in can be used in usecase diagram). Anyways i've made simple usecase diagram of e-learning platform, like lynda but you have to pay for individual course you'd like to take. Any suggestions/corrections about my diagram? (i'd like to bring more usecases into it)
