It’s worth investing some time into learning what all of the base modules do before you start construction.
Normal is enough of a challenge for most. XCOM is a notoriously hard game, so don’t go all out with the difficulty settings if you’re a beginner. Veterans may want to take a look through the following as well. If you’re played an XCOM game before some of these tips will be familiar to you, but XCOM 2 is a whole new beast requiring all new tactics. That’s right, if it wasn’t bad enough there is ow a timer to contend with along with the super powerful, technically advanced aliens. Each mission will start with you being dropped into hostile territory filled with scary powerful aliens and the goal of fighting your way through them to a specific point before the timer expires. The XCOM universe is a pretty scary one, especially for a new player.