You can quickly murder the necramechs using your own necramech.
Press 2, press 4, shoot off both arms (aim for the shoulders) and you're good.
If you don't have a necramech, uhhh... ask someoen who does to join you until you do :V
Reddit has done so much worse than that, up to and including hosting sexual content involving minors (and defended it!).
However many it needs.
If I'm dealing with a weapon with riven, I might go for 5-7 so that I get some flexibility. Usually up to 4 for non-riven.
Frames is a more by-use basis. I generally play mostly with prime frames so I will always consider an aura forma, I have a bunch. Then I just start using the frame and as I notice things I want to change to make the frame better, until I stop noticing what could be better. Typically I end up with forma'ing frames up to 3 times, the most extreme being.. 7? I think I made a mistake on that one at some point and ended up undoing it, but I'm not sure.
Focus on a couple of things at a time and figure out what stuff you can trade for.
Personally, I made a spreadsheet for tracking all of this and I used the in-game profile and foundry (once I had the BP of something) to keep track of what I was missing.
No.
Either trade for it (and if you're worried about received plat being illegitimate, make sure to not spend all your plat for a while) or buy it from DE.
The glitch is that it hasn't been tracking node completion for the Zariman nodes themselves.
I don't like Reddit, so here I am instead.
You're probably a bit too weak.
You could make a braton rank 23 work, but you'd need good mods (which you probably don't have yet).
My personal recommendation is maybe do other content, hit MR4 and get yourself a Hek.
You are correct.
If you're not player #1 (as in, the one that gets waypoint #1 when placing a waypoint/marker) and the bounty is done, you can safely extract with the button without fucking over anyone.
100% as I probably will never need more platinum ever.
I'm sitting on a stockpile of relic parts and I can just.. sell some off should I need some.
Saryn, purely due to how the frames are accessed.
Mirage is acquired through a quest you'll do at some point anyway, Saryn is from a slightly annoying boss to run in Sedna (requires you to do arena points to gain points which can then be spent to access the fight).
Just generally, if in doubt, pick the one that is hardest to get.