I came across this blog that’s dedicated to ‘Books of Knowledge’. From what I know, the brother/sister will be first going the fundamentals of Tawhid with the first book, Kitab at-Tawhid by Imam Muhammad ibn Abdul-Wahhab (rahimahullaah). So whomever wants to increase their knowledge about Allah the easy way (by the will of Allah), then I suggest you follow www.kitabs-of-ilm.tumblr.com .
May Allah make it beneficial for us all. Ameen.