Are you looking for reading practice, or grammar information? If you’re looking for reading practice then something like Satori Reader (or TangoRisto, though I’m not sure that provides explanations of grammar) might be what you’re looking for, but they’re not exactly for complete beginners - see this thread (#shamelessselfpromotion).
If you’re just looking for grammar instruction, then I agree with something like Tae Kim. I can’t really think of any resources that provide purely what you’re asking for.