What is the most efficient way or most useful way to put in certification points? Weapons? Vehicles? Are there any essential upgrades?
closed as not a real question by BlueRaja - Danny Pflughoeft, kotekzot, Bora, kalina, Private Pansy Mar 18 at 10:30
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It depends on your playstyle.
Essential upgrades are:
Recommended for organized play:
In general, don't worry about wasting Certs. There is an infinite amount of Certs, so you will eventually unlock everything. Just try around, use the VR training area to trial stuff and if you unlock something and it turns out to be not your thing it's no big deal.
There's no real answer to give you to this. However, I would recommend that you consider at the very minimum getting the spawn upgrade for the Sunderer, it's absolutely vital if you use it, to give you greater power projection (in other words, friendly troops can spawn in the enemy's backyard rather than several kilometres away).
For everything else, it depends how you prefer to play. Squad leader upgrades are helpful if you run groups, but in most other cases it's better to just pick a couple of classes and vehicles to specialise in then focus your certs on upgrades that fit your play style.