Assault Rifle Tank is a very basic and quite easy build for beginners. You can use 8.6 caliber to gain access to incendiary ammo and use magnesium/napalm grenades to set stuff on fire.
Here's a simple AR tincan build:
https://underrail.info/build/?HgkGAwoJAwbCoG4AAAAAKEsyAAB4eDIjeAAAAAAAAFAIYjsWFSZKVUljHwLCtcKk4qGHBOKnqgPip7QI378You are almost immobile but you will have lots of health and be able to tank most normal attacks. Preferable gear is metal armor, metal boots, metal helmet with shaded glasses and assault rifle Hornet model 8.6 caliber with rapid reloader and muzzle brake upgrades. Assault Rifles use up lots of ammo so be prepared to make lots of it.
Combat strategy should be simple: you use burst attacks on enemies and watch them die and throw a grenade from time to time if they are too far away.
Feats more or less in order, you can also add later two more feats of your choice. If you feel like it, you can add some skill points into pickpocket (to steal ammo from people) or persuasion.
Level 1:
https://underrail.info/build/?AQgGAwkGAwUPDwAAAAAADw8AAA8ADw8PAAAAAAAAAAhi378start by adding two points into perception when you level up to unlock concentrated fire feat, then one point into strength to be able to wear tungsten metal armor, then one point into consitution to unlock thick skull, then one point into perception and last one into whatever (intelligence or dexterity if you want three-pointer feat). You can dump intelligence completely if you want but i'd suggest against it for the first game since it will make crafting early game harder.