Statistical Associates Publishing
Statistical Associates Publishing is a website that offers guides focused primarily on correctly executing various statistical techniques. The guides are short and provide screenshots and step-by-step instructions for for some of the major commercial statistical packages. One can buy the books - each at very low prices $5USD or less per book from Amazon - or request a free copy from the publisher with some reasonable restrictions on use. I should note that since I don’t spend much time doing statistics myself, I feel a bit unqualified to attest to the quality of the materials.