Coding style:
- bash syntax
- variables,arrays are named _BIG
- functions are named _small

Use:
- bash
- curl for downloading files 
- systemd
- shellcheck

Don't use:
- fuse, perl, python

Kernel Modules / Kernel Firmware:
- only modules that are needed to access filesystems, input, network
  video and virtualization
- only network modules for max. 1 Gigabit.