Art is subjective, diverse and with no agreed definition. If you create something you like, share it. Others may like, some may not, it doesn't really matter so long as you like it.

The simplest tools for creating visual art are paper and pencil. There are plenty of turorials out there, my favourite tutorial creator at the moment being MikeyMegaMega (Patreon / YouTube).

If you're looking at creating Digital Art then there are plenty of tools out there to help. I favour the open source tools as I'm a Linux user. You'll find a list of my favourites below. I tend to start with a pencil sketch which then gets scanned into the computer for tracing or touching up. You'll find a few creations of my Patreon site.

Adobe Stock

Adobe Stock is a great way of generating revenue from your creations.

After creating your account, you can upload your creations. Your uploads will be vetted to ensure they meet the quality requirements and then they'll be available for people to purchase. You'll get a dashboard to track your sales and top downloaded content.

Adobe Stock is also a great source of reference material.

Inkscape

Inkscape is a vector graphics editor. Like most tools, there is a bit of a learning curve. Stick with it. Make use of layers to separate parts of your work. Don't be afraid to pull in reference material to help guide you.

In my post Anime in Inkscape, you'll get a rough idea of what can be accomplished by a beginner.

GIMP

GIMP (GNU Image Manipulation Program) is a raster graphics editor. If you are looking for a tool to perform basic editing (cropping, rotating, resizing) then I tend to recommend Pinta or Shotwell. GIMP can perform these basic tasks but it can do a whole lot more.

GIMP, like most professional editors, has the concept of layers. This is especially useful if you're using reference material to sketch over or trace. There are plenty of tutorials you can follow to build up your basic skills and knowledge.

In my post Anime Waifu GIMP, you'll see how you can use GIMP to improve a hand drawn sketch.

Pitivi

Pitivi is a video editor based upon the GStreamer Editing Services library (GES)

I prefer Pitivi as it has the user interface is a simple/intuitive and packs in most of the features I would tend to use when creating videos.

Blender

Blender is a 3D creation suite.

Natron

Natron is a digital compositor for VFX and motion graphics. The node based engine suits my background in software engineering.

Whether you expect to be performing any Visual FX or not, it is worth looking at a few Natron tutorials as they'll give you some background into some of the basics for animation and editing. Open Visual FX is a good source of information and the Compositing in Natron video tutorial is a great place to start.