• So you want to train a Psi Operative. Having read our beginners and advanced player’s guides, and mastering the early stages of the XCOM 2 campaign, it’s time to find out what XCOM 2 has in store for players with its final soldier class. Fortunately, there’s a whole lot more reasons (starting with fun) to focus on training Psi Operatives in XCOM 2.
• Engineering Projects in XCOM 2 can be done by Engineers in the Proving Ground within the Avenger. The Projects improve aspects of your ships, improve the quality of Weapons and Armor and generally make you more powerful. Below is a table of Engineering Projects, their costs and time to complete, along with their effects.
• XCOM is a notoriously punishing series of strategy games, from the 90s originals up through Firaxis’ fantastic reboot, and XCOM 2 is no different. In many ways it’s significantly harder than.
• Long War 2 is a significant overhaul of XCOM 2 aimed at giving players the feel of running a worldwide guerrilla war against ADVENT and offering them a greater variety of strategic and tactical experiences.

[A side note- can we sticky the class build threads? They're quite useful and I keep having to search for them]
What are people's thoughts for builds on the SPARKs? I almost feel like Bulwark is just so good you have to take it every time. I currently have a high-aim SPARK build for Overwatch, which he does terrifyingly well; however, I have no idea what to take at Paladin rank (Channeling Field/Wrecking Ball/Holotargeting) as Channeling Field is just crap and neither of the other two synergize with the build at all... similarly, if I'm making my SPARK non-shooty I have no idea what to take at the very first rank; both Shredder and Combat Awareness assume the SPARK can hit targets... Iron Skin seems incredibly situational though. Anybody have any advice?

Xcom 2 Build Guide

Xcom 2 - What Is The Optimal Base Layout? - Arqade

Having a poorly built squad will lead to your doom. For the best results, you’ll have to carefully choose abilities when your soldiders advance through the ranks. This guide will show you the best squad skills builds in XCOM 2 that will help you win most fights.