It’s far from comprehensive. Rather, it’s a survey of some techniques and ideas that will let you spend less time typing and more time just doing stuff on a Raspberry Pi or similar machine.
Reading the documentation
Installing software on a Raspbian system
Shell patterns and regular expressions
Finding files and text
Terminal multiplexing with tmux
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.