any quest a new player should prioritize?

[SuperbDave]

for example, the excalibur umbra quest was really helpful in providing first prime frame. any other quest that give really good stuff?

[Pakaku]

Most of them give good stuff. The mainline quests progress the mainline, obviously, and many of the sidequests offer Warframes. The only reason to avoid those ones would be if you can get their primes first, which isn't the case yet for frames like Nidus, Revenant, or Inaros.

The only ones that look worth avoiding might be Howl of the Kubrow, because Kubrows are tough to maintain without good mid-game mods and are outclassed by Kavats. And A Man of Few Words doesn't really lead anywhere interesting unless you care for Clem stuff

[Mhblis]

If youve done Umbra you are no longer a new player. At this point you are nearing endgame.

The none story quests give frames or unlock farming nodes like index.

Limbo is a commonly used frame and very useful.

Octavia's quest is a birlliant one and fun to do.

Sadly the rest are fun but not critical in anyway.

And then of course keeping going with the story to unlock your railjack and start the sentient based weapons.

[Walrus-Sama]

Originally posted by SuperbDave:

the excalibur umbra quest was really helpful in providing first prime frame.

Excalibur Umbra is not a Prime, he is an Umbra. They are different things.

[Livia]

Yes, your health, I grind for 24 hours now, going to sleep.zZ

[Security Cam #7]

Originally posted by Mhblis:

If youve done Umbra you are no longer a new player. At this point you are nearing endgame.

More like finishing the hidden tutorial and entering midgame

[Ratt]

Originally posted by Smelly Fish in a Hazmat Suit:

Originally posted by Mhblis:

If youve done Umbra you are no longer a new player. At this point you are nearing endgame.

More like finishing the hidden tutorial and entering midgame

So it's the same type of stand as Path of Exile.

[Walrus-Sama]

Originally posted by Smelly Fish in a Hazmat Suit:

Originally posted by Mhblis:

If youve done Umbra you are no longer a new player. At this point you are nearing endgame.

More like finishing the hidden tutorial and entering midgame

Not even midgame. Like 1000-ish hours is still considered a new player in Warframe, lol.

[jonnin]

all of them, but do what you can and if it is too hard, come back later after prepping or reading a how-to or gearing up.

[2BrianCells]

Try rising tide, to get your own ship

[MrWitz]

The War Within.

Once TWW is completed, the player will have unlocked just about all endgame content (including sanctuary, arbitration, and kuva system) minus rail jack, which no on cares about.

Then they can work on the rest of their quests at their own leisure. But TWW needs to be their goal as soon as possible.

[SadiqNZR]

"Sands of Inaros"

You can buy the quest from baro when he comes to the relay. Complete the quest and you will get a god-frame who literally can't die.

[Security Cam #7]

Originally posted by BigZ:

The War Within.

Once TWW is completed, the player will have unlocked just about all endgame content (including sanctuary, arbitration, and kuva system) minus rail jack, which no on cares about.

Then they can work on the rest of their quests at their own leisure. But TWW needs to be their goal as soon as possible.

Wrong. Arbitrations get unlocked if you do every single node on the map. You can do TWW without that.
Besides, OP really doesn't need endgame content when he doesn't have gear and mods to face it.