piggybacking for the general advice,
if you care allot about story content stay away from devstreams and primetimes and such because they talk about endgame mechanical spoilers all the time, this game has one of the coolest story and mechanics based reveals in games right now that’s super worth discovering for yourself. just focus on working your way through the star chart and quest content and enjoy the twist, its unlikely to get spoiled for you in game as the community is fairly good about that, enjoy the big reveal in “the second dream” quest.
2 super solid warframe recommendations for new players is Rhino and Oberon both can be built relatively cheaply and quickly and will carry you to the end of the starchart no worries same with the hek shotgun and grakata machinegun.
when it comes to picking your first warframe at the beginning Excalibur is the most well rounded and the best choice imo.
if you do go into a mission with other players don’t be surprised or get too dismayed if high level dudes literally fly through the level at 10 million mph either killing everything or completely ignoring everything but the main obj. you’ll pick up the muscle memory for the movement and tile familiarity and be going as fast as them in no time, its worth gathering resources and taking your time at low rank to build up your stockpiles. and killing enemies for the xp.
try to always have a some equipment building so you can keep rising your profile rank and your not stuck not leveling something.
good luck tenno. see you around the origin system.