What term would you use to refer to "jobs" and "tasks" collectively?

Hi. I know a job is a group of tasks done, and a task is a specific type of piece of work done. If you want to refer to both jobs and tasks collectively would you refer them both as "activities"?

I bought a transcription headset and foot pedal so I can do transcription work from home. I want to learn how to voice act professionally for cartoons I want to produce. I signed up for an online voice over training program. I also want to learn how to use various art programs for free through an online learning system provided from my local employment center. I want to learn how to use this software to produce my own cartoons and comics.

These are three different things I want to do at the same time. Would it be correct to say "three different activities I want to do at the same time"?

I need to know this because i want to ask a question about juggling more than one thing at once.

Please help. Thank you.