Three months ago, I started to work in Unity 2d game development. I am student in electronic engineering and programming, so I like to work on animations in my free time and create games. I also create game textures in photoshop. All in all I'm hobbyist.
But I find it hard to create animations. I work in Spine 2d and I can't create smooth 2d animation. I try to make a working 2d walking animation for my heroes but it ends to be a big fail.
Is there any book, or video tutorial, something very detail, but easy to understand for basic character 2d animation? (ilde, walk, attack, death, etc) Here are some of my animations for reference: