Clip studio Paint and Photoshop are unbeatable for resources.
Neither is beginner friendly, I would say. So spend some time doing a tutorial or two to get to know them. Bear in mind newer photoshop has gone down the drain lately with the implementation of AI tools which comes with a lot of annoyances and user-unfriendly features in favour of implementing their AI tools. But it IS the industry standard, even though most people that have used it for years have a lot of beef with Adobe's recent direction.
Clip studio paint is excellent if you're doing comics, anime art etc. They have a TOOOONN of tools and downloadable resources for that. Great animator's resources too!
Krita is really good to learn the tools. It's straight up free, so no drama with it. And it's just a great piece of software.
In the end, it's down to what your needs are.