There is actually a model, that doesn't need dark matter and such things, which is called plasma cosmology or electric universe. The rotational aspect of galaxies is pretty easily explained with knowledge about plasma, loaded particle clouds and an understanding of electricity.
The best thing is, they can actually predict stuff. Contrast that with dark matter theories and gravitational models.
Check out the SAFIRE Project https://safireproject.com/ for an interesting experimental take on the sun.
These are some pretty old websites, but there is still some interesting stuff to learn about. https://www.plasmaresources.com/ https://plasmauniverse.info/ https://www.plasmacosmology.net/ https://www.electric-cosmos.org/
Something more up to date: https://www.thunderbolts.info/wp/eu-guides/beginners-guide/ https://www.thunderbolts.info/wp/eu-guides/eg-contents/ https://www.thunderbolts.info/wp/eu-guides/misconceptions/ https://www.holoscience.com/wp/
This is their YOUTUBE Channel: https://www.youtube.com/user/ThunderboltsProject/playlists