A few questions now that I finished the story and hit 20:
* I see the option to replay story missions at different levels, but I don't see any options at all when selecting strikes. Can you not select harder levels for strikes? Do players just run lower level strikes or move on to the randomized playlist? I was hoping I could run some matchmaking strikes at level 20 after finishing, but is this not how it works?
If you reached level 18+ I believe, you should have unlocked something called "Vanguard Strikes" which is a strike playlist that just does strike after strike randomized. There you can choose levels (I believe it's 20, 22, 24, 26 and later on you unlock a level 28 night strike). IMHO don't bother doing these to get better loot if that's what you're planning to do, they give you shit like 90% of the time and you can do better by doing one of the farming spots in the game for engrams. Or Crucible.
* Light. Does equipping armor with the light attribute automatically grant you light points and raise your level? Or does equipping light give you the capability to earn light-based XP to continue leveling up? I have some minimal light gear but my level is still just 20 - if its not XP based, how many light points do you need from your gear for each level up?
You need a decent amount of light on each armor piece to get higher and higher. Think like 10+ on each to be 22-23 or so. All you have to do is get armor pieces, either from crucible drop or from engrams, that give you more light and once you equip it your total +light is added up and it will tell you what level you are with your current armor.
So has it been established what the best way to farm Vanguard Marks is? (And rep too, although I'm okay on Rep... not so much on Marks).
imho if you don't feel like doing the spinmetal farming, which imho is plenty boring, then the best way is strike playlists and public events. If you're level 22+ you can do the level 22 strike for 4 marks each time. If you're level 24 you can do the level 24 for 6 marks each time. So starting tomorrow I gotta do the level 24 strike around 10 times so I can buy another legendary armor piece off vanguard folks.
As to rep, the best way imho is to get a bunch of bounties and go do the appropriate mission/patrol to get all of those daily bounties. Some give you 50, others give you 100. I think the total I got in 2 days straight was around 300-450 per day. Then if you do a couple of patrol missions each gives you 10-25, with 25 being the assassination missions. You could easily get 500 rep per day without a stupid amount of grinding if that's what you want.
Do you promise, Admiral Puppy?
Fur sure, unless something big comes up in which case I'll let you know.