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I essentially have 6 opponents in my life, and I'm trying to build a Space Marine army that won't lose evey time.

1.A Lions of the Emperor Terminator Heavy Custodes list

2. A Big Knight, Canis Rex and a whole lotta Armigers.

3. A Krieg Infantry Spam army with no vehicles.

4. A Raven Guard army with lots of Lone Op nonsense. Including 3 blocks of 3 × Las Fusil Eliminators with a Librarian so I can't shoot them past 12"

5. Deathguard Terminators en masse.

6. A C'tan Spam Necron army.

Do you have any advice for dealing with these nightmares?

I realize that I don't play against normal players.

I don't have much experience against most of those matchups, and I don't play my marines very often. So having established that I don't know what I'm talking about, here are my opinions anyway:

1. This one seems pretty manageable. Splitting up will make Oath of Moment less useful, but it will still let all your bolt weapons wound on 4s. You should be able to nickel and dime these guys to death and generally have more ranged firepower with which to soften them up. Your biggest threat is just letting them get the charge off on you, so consider running the Vanguard or Shadow Talon detachments for some reactive moves. Hellblasters are silly and should be very effective here.

2. Oath of Moment lets you handle this matchup better than most. I've been amazed by how easy it is to bolter armigers to death with intercessors thanks to oath of moment. Your whole army has grenades, so be sure to use them. Most of our anti-tank weapons should be varying levels of effective. Again I'd consider the Vanguard/ST detachments for reactive moves purely because making an expensive enemy unit fail a charge is a big deal. You also might consider the +1 strength wtihin X" detachment. Bumping your bolters up to S5 means you're wounding armigers on 5s and your armiger oath target on 4s. Prioritize dakka over choppa here.

3. I'm not familiar with krieg infantry spam. Can you not just shove a bunch of power armor down their throat and out-board control them with better base stats? Intercessors seem like a great tool here. 20 shots per 5 bodies is a great way to clear through T3 W1 infantry.

4. They're designed to be hard to shoot to death, so just get in close. Go with the +1 strength within X" detachment. Consider drop pods or options that let you put a lot of stuff in reserves. Show up next to the enemy, and give yourself the edge with a decent alpha strike. Then just accept that you're going to lose a couple of units to Shaan or Shrikes' units, and be ready to punish them with standard anti-marine tools. Hellblasters, as always, should be good in this matchup. They'll have some redeploy shenanigans, so remember that they'll have the option to show up behind your main force. Ideally, I think you skip screening here and just force them to come to you.

5. Rough one. I think just stock up on multi-damage weapons and make use of Oath of Moment. Here you probably *do* want some screening units assuming they're going for the 6" deepstrike trick. If they're investing heavily into slow, expensive units, you can probably just move away from any termies that aren't near objectivevs and throw the rest of your army into controlling NML. Consider hellblasters and Vanguard again.

6. Another rough one, but again, Oath of Moment makes your whole army more efficient than it should be into a small number of expensive models. So bulk up on multi-damage weapons with decent strength. Hellblasters, perhaps.