People are currently reading this guide.
You can try animation programs such as OpenToonz free or Adobe Animate paid. Both have basic tools for creating 2D animations and there are plenty of tutorials online to help you get started. You could also watch animated shorts or films you enjoy and use them as inspiration for your own projects. It's best to choose a simple story or scenario to start so you have a clear goal and can focus on the process of animating rather than getting bogged down in details or complex plots.