Nowadays, I prefer to make my own art for my games. However, the jam says that I'm only allowed to use "free assets" and that I must link them.

Does this mean that I'm only allowed to use art assets from online? Or am I allowed to make my own art?

you are allowed to use your own made assets and free assets

way back (page 2) on the discussion threads there is this one... https://itch.io/jam/historically-accurate-3/topic/848902/if-i-make-assets-myself...

Tldr... Yes you can make assets.

Thanks for your replies!