CasaOS is not an operating system and more like a GUI for Docker with access to the terminal via said GUI (at least thats how i used it)
I personally think thats a very good option if you simply want to use an old PC to host stuff and test around but its limited in its scope so if you want things like RAID you need other or additional solutions
TrueNAS is an operating system
Might be overkill for a newbie and i think it was ressource intensive but offers a lot of features in return like RAID
Cant really say more because i did not visit the websites recently
dont know Yunohost
CasaOS is not an operating system and more like a GUI for Docker with access to the terminal via said GUI (at least thats how i used it)
I personally think thats a very good option if you simply want to use an old PC to host stuff and test around but its limited in its scope so if you want things like RAID you need other or additional solutions
TrueNAS is an operating system Might be overkill for a newbie and i think it was ressource intensive but offers a lot of features in return like RAID
Cant really say more because i did not visit the websites recently