Most of these tools are more capable than I described and there are many more foss tools out there.
Edit: just saw the iPhone part of your message. (Sorry about that) Even an old computer is capable of using most of these. You could consider running Ubuntu on one.
Here are a couple of completely free tools to explore your goals.
Adobe’s suite isn’t the king it once was.
https://docs.krita.org/en/ (powerful image editing)
https://inkscape.org/learn/ (vector illustrations)
https://docs.blender.org/manual/en/latest/ (animation tool)
https://cdn.openshot.org/static/files/user-guide/index.html (video Editor)
Most of these tools are more capable than I described and there are many more foss tools out there.
Edit: just saw the iPhone part of your message. (Sorry about that) Even an old computer is capable of using most of these. You could consider running Ubuntu on one.