This video above ^ has everything you need to know from the basics to the advance tricks. This has every single trick you can do on Doom Unity (at this moment). If you have further questions or need more help, feel free to join our discord

Basics: 0:00-5:12 Advance: 5:12-17:04 Strafing: 5:15 Open doors fast: 6:24 E1M2: 7:20 E1M4: 7:47 E1M6: 8:10 E1M8: 8:49 E2M2: 9:25 E2M6: 9:47 E2M7 (door trick): 11:48 E2M7 (rocket jump): 12:18 E3M4: 12:59 E3M7: 13:24 E4M1: 14:26 E4M2: 14:45 E4M4: 14:58 E4M5: 15:08 E4M6: 15:18 E4M7: 15:54 BFG 9000: 16:07