Some common words and processes used in device development groups

• Clean flash

Wipe Dalvik cache, cache, data and system and then flash a ROM zip ( Wiping Internal storage is optional, Wipe it for a cleaner experience )

• Dirty flash

Wipe dalvik cache, cache, system (not data) and flash ROM zip, then flash gapps (if ROM zip doesn't include gapps, flash same gapps as you flashed before, don't change gapps when doing dirty flash), flash magisk (optional)

• How to take nandroid/recovery backup and restore? (Only Possible In Decrypted Custom ROMs)

Boot into recovery, tap on backup and select following partitions:» Data (compulsory)» System,Vendor and Boot Image (optional but highly recommended)Swipe to backup.To restore later, just boot into recovery wipe dalvik cache, cache, data, system and vendor and then flash zip of ROM that you took backup of and then tap on "Restore" section in recovery. Select the backup taken previously and restore.

• How to take migrate backup of apps and apps' data and restore?

Migrate app and instructions how to use it

• How to flash a kernel?

See This Guide