Instructables is an encyclopedia of interesting DIY projects with easy to follow step-by-step instructions and online classes.
Instructables is a place you can learn almost anything. It specializes in user-created and uploaded do-it-yourself projects that have clear step-by-step directions. The directions are text and photos, with video and downloadable PDF's on most projects.
I've used Instructables over the years to learn a variety of things. Projects are submitted by users (or you can create your own how-to and upload it) and rated by the community. It's a good alternative to sifting through YouTube videos. Some projects require certain skills, and if you don't have them, a project will often link to an Instructable that does. For example, the stained glass clock project links to a how to cut glass Instructable.
Anyone can view the projects, but if you want to take a class, ask a question, add a tip, post a comment, upload a project or join a contest you'll need to create a free account. You can log in with Facebook, Google, Twitter and Autodesk, or create an account using an email address.
Instructables is owned by Autodesk, creators of AutoCAD, among other things.
These are the main categories for projects, and you'll find a huge array of how-to's under every category.