Hello. I've been playing for a few weeks and I wanted to know what arcanes are the best/must have for most frames/weapon builds. So far I've been able to get Molt Augmented and Primary Merciless. I know about Energize but its super expensive for me.
The previous post answered your direct question well, but I feel like I should add: arcanes are not going to make nearly as much of a difference as a complete set of the essential mods. Obviously there are some mods you can't get yet (and the ones locked behind daily tribute simply can't be rushed in any way), but there are some staples you should be sure you have. Firstly, make sure you have the basics: Streamline, Intensify, Serration, Hornet Strike, that sort of thing. Those will come just from doing a variety of normal missions, and if you're missing any then just ask someone in your clan or trade chat since most of us have many extra copies of each. Then, make sure you have a good collection of Corrupted (especially all of the Warframe ones) and Nightmare mods. Augur mods are another good addition.
Basically, what I'd suggest is checking out some endgame builds for Warframes and weapons, and making sure that you can do something like them. You'll have to replace some primed mods or especially rare or hard-to-obtain ones, but be sure you at least have a more common version of those mods (ex: Pressure Point instead of Primed Pressure Point, Split Chamber instead of Galvanized Chamber).
In Warframe, mods make the world go 'round. Whichever world that is.
Thanks for the advice. Atm i'm slowly getting ducats so I can buy as many mods from Baro as i can when he comes for Tennocon. Idk how many ducats/credits I will need but i've been told to get as many ducats as I can (I only have 3.5k ducats and 15M credits)
I suggest you dont sell anything for ducats until you know what you want to buy and how much you need. Then try to get by with only selling duplicates at first, this way you can build your arsenal at the same time for MR experience.
And if you want to take it a step further, check the prices for the pieces before you sell them. You might have gotten a vaulted piece from someone elses relic that you are not likely to get ahold of again any time soon