Back in my early days of Linux, the terminal was a necessity. Now, the GUIs are so advanced, user-friendly, and powerful, that you could go your entire Linux career and never touch a terminal window.
Google is developing a Linux terminal app for Android. The Terminal app can be enabled via developer options and will install Debian in a virtual machine. This app is likely intended for Chromebooks ...
TLDR and Cheat don't replace man pages; they complement them. They're perfect for day-to-day learning and quick reference ...