Manufacturers that produce woodworking tools and materials have got into the content creation game, too, and some will share woodworking plans online. Minwax and Ryobi, for example, provides their plans free of charge, and Rockler offers their woodworking plans for a fee. Seek them out along with the other blogs and you’ll have a handy list of resources you can turn to for any project.
You can also use Google image search to research a project. Unlike the PDF search, the image search provides a photo of what the project will look like, which is helpful in determining if you want to pursue building it. By doing an image search for how to build a step stool, you will have a ton of options that all lead to woodworking plans of various quality. (The how to part of these is important—otherwise you’ll just get pictures of step stools.)