It requires, but rewards time spent on it :D.
There is no must read strategy guide that I know off, just principles i think.
For example, from what I can gather, science seems very highly prized because it unlocks your toys faster, and sometimes considerably so, e.g. if you dedicate your first city to science, maybe your second, and rely on your starting stack for clearing, produce a few units along the way, and try and get your 3rd city to be a unit producing centre (i.e. production.)
The way the game works, you aren’t going to have very large armies, so you can leapfrog with science to unlock your better units and base your strategy around the mid game stuff/later early game stuff, for example researching cool laser mods and massing Vanguard cycles.
That’s general stuff. Now one, more specific , thing I have been doing is playing Vanguard and getting the rail gun accelerator very early on, and having had my troopers use the shock damage mod, half the bleeding damage mod, and massing troopers.
A few Pugs to help my leader, because they can reset once per battle abilities. My leader tends to rock an APC, so having multiples of the healing drone are pretty helpful.
I like to pair this with Void tech and have a few of their T1 melee unit, because they can split into 2 in battle, and work very very well at tying up the independent and the AI, allowing my longer range troopers to make a firing line.
Honestly, that alone would be enough to get you through half the game easily. :D
I haven’t played around much with Engineers, but a popular thing to do with them is to use Pugs to reset their summon turret ability, say for example 3 engineers and 3 Pugs, which will get you upto 6 turrets in a battle. Placed well, they can either be a great distraction or good damage dealers. Turrets also inherit some mod characteristics of the engineer iirc.
Walkers are basically tougher troopers, with a missile attack.
Vanguard tanks are one of my favourite units.
The Drone Carrier was lacklustre at release, and is harder to use than something like the Herald of Oblivion, but you can, if done right, just keep summoning drones in battle. They are a great distraction, but also deal damage in their own right.