If you're willing to compile it, Aseprite is a great option as well.
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Christian Cunningham has recently shared a new guide to working in Maya. The tutorial on Gumroad goes some basic concepts, navigation aspects, useful tools, and other things that will make your life easier. Basically, this is a great guide for beginners that can help you get started and lead to your first modeling experiments.
I assume the viewer has never touched Maya before. Before jumping into Maya I talk about basic modeling concepts and best ways to break down a model in your head so you can model it with ease. I then open Maya with a default workspace and go over basic navigation first.
Then I start going over every tool I use on a daily basis. In my opinion, there is no point in learning everything Maya has to offer, you should use a set of tools to define your workflow. I then go over how to model this gun. I do not go over every piece but I teach you the tools you need to model the entire gun. In the 2nd video, I have a timelapse of me modeling the entire gun using only the tools we learned in the first video.
Do you want to learn more? Head over to this page.