I'm new to the Android scene. What the essential Android apps (for phone)? On the go, my data limit is very very low, so apps which can work offline are the most suitable. Also, apps which have small disk space footprint are appreciated (my phone only has like 7GB free). I installed https://play.google.com/store/apps/details?id=com.navigation.offlinemaps.gps&hl=en_US Other things I am looking for: 1. Something to navigate directories and create small text files for notes. On linux, I use a console, cd to directory, ls, ls -l, mv, and vim. What would be the equivalent for Android? 2. How do I transfer files in between my phone and my linux computer? 3. Something to check email (not gmail). 4. A scanner app. Is camscanner the best? 5. An alarmclock with adjustable alarm volume. 6. A scientific calculator. 7. A music player, that has good frequency manipulation features and bass boost.