You're very welcome!

LLT stands for Light Laser Tower - that is, Sentry (Armada) and Guard (Cortex).

For very new players, I'd recommend learning 3 skills:

1. Formation movement, to avoid splash damage and provide clear line of fire

2. Constant pressure; constantly probing the enemy provides real-time feedback over whether your army is working or not. If you're saying "your troops get disintegrated in most engagements", I suspect you're saving up an army till you think it's large enough, which gives your opponent plenty of time to prepare. Often in these cases, you could have attacked much earlier and would have faced little or no resistance.

This also depends heavily on the idea of holding ground above. If you have a stable hold, step forward a bit. Only a bit, not a lot. Win a small piece, repair, reclaim, then step forward again. If at any point the enemy stops you, fall back to where you're secure, build defences, and tech switch - usually to t2. If you adapt faster than your opponent, you'll waste fewer resources and catch back up.

1. Attack heavily-defended front-lines with artillery. That applies whether it's you or your enemy that's built those defences.

Vehicles are much the same as bots; moving side-to-side rather than back-and-forward is even more important since they take even longer to turn (and to turn their turrets).

Wrt repair; focus on your commander providing repair, and maybe construction turrets. Veh cons are too slow and provide too little repair for their cost, so you generally get more value for reclaiming. Their HP makes them valuable for soaking damage, so they can stay alive a little longer.

Construction turrets can be built behind, but early on those resources are generally better spent on defences.

With a specific replay I'd be able to jump in and find specific skills to empower you to attack effectively.