We use the phrase '(be) + going to' to talk about future plans.
For example: John: 'What are you going to do this weekend?'
Sally: 'I'm going to watch the match on TV'.
Can you think of 5 things that you plan to do this weekend?
I'm going to...........
We use the modal verb can to talk about a person's ability. The modal verb is followed by the infinitive form of a verb. The negative form is can't.
For example: Sally: 'Can you play the piano?'
John: 'No, I can't, but I can play the guitar.'
Can you play a musical instrument?