I use Inara crafting list to keep track of what I need. At the start of your engineering projects I will suggest getting a varied stock of the top grade materials you can, and then trade them down as needed for your current engineering project.Ive been doing a lot of mining, so been picking up lots of materials along the way... but basically ignored them so far.
is there a general strategy of what I should be doing with them... e.g I read something about 'trading up' common materials, as there's a limit on them.
or do I need to switch focus, and look to see what Im missing for particular engineering tasks?
i.e. for now, my approach was just to let them build up, and hope if/when I turn to engineering I would have some of what I needed...
but perhaps it'd be wise for me to already do some material trading ' along the way'
... but if its very depending upon what engineering that I want to do, then I might as well leave this until, I shift my focus?!
Manyfacturedmaterials like Pharmaceutical Isolators are sometimes troublesome to get, and Military Supercapacitors very rare. Imperial Shielding drops in generous quantities in the right locations, so it's a good one to collect and trade across 6 for 1 for any top grade manufactured material you are having trouble finding.
Always good to salvage the wreckage of your enemies and collect materials as you encounter them to avoid spending too much time just hunting materials.
Also be on watch for missions with material rewards.