Anything in a rar/zip or folder includes the install apk and sd card data files, or the install apk and activation key apk to enable full version.
If you want information on something use appbrain or just put APP NAME + Android in google and you should find what you're looking for.
Learn to Paint People Quickly: A practical, step-by-step guide to learning to paint people in watercolour and oils (learn quickly) by Haze Soan English | 16 Mar. 2017 | ASIN: B06XQ3721X | 112 Pages | AZW3 | 9.91 MB
I Heard You Paint Houses: Frank "The Irishman" Sheeran and Closing the Case on Jimmy Hoffa [Audiobook] by Charles Brandt English | November 18, 2008 | ASIN: B001LNK9IS, B01LT5L0QM | MP3@32 kbps | 12 hrs 38 mins | 172 MB Narrator: Scott Brick