Don’t copy walkthroughs, try yourself before searching and asking for help. Complete OverTheWire.org/bandit levels: Level 0 Level 0 → Level 1 Level 1 → Level 2 Level 2 → Level 3 Helpful: Use a Linux Cheat Sheet. Use the #hints channel via the OverTheWire Discord.
Go to OverTheWire.org/bandit and complete: Level 3 → Level 4 Level 4 → Level 5 Level 5 → Level 6
Go to OverTheWire.org/bandit and complete: Level 6 → Level 7 Level 7 → Level 8 Level 8 → Level 9
Go to OverTheWire.org/bandit and complete: Level 9 → Level 10 Level 10 → Level 11 Level 11 → Level 12
Go to OverTheWire.org/bandit and complete: Level 12 → Level 13 Level 13 → Level 14 Level 14 → Level 15