There are several ways to complete missions and infiltrate enemy strongholds in Santa Blanca. The key to selecting the playstyle that best suits you is found in the Skills you select. To purchase new Skills (and upgrade ones you already have) you need a combination of levels, Skill Points, and Resources. Levels happen as you gain Experience points from completing missions and taking out enemy combatants. Resources are found all over the map and are often encountered during missions. Skill Points are a little bit trickier.
Skill Points are awarded for leveling-up, but that’s just the tip of the iceberg. You’ll need significantly more Skill Points than what you receive from leveling-up alone if you want get as many skills as possible. That’s where Intel comes in. Nearly every enemy stronghold or location has Intel stashed somewhere in it. Whether it be an Intel Cache or a Lieutenant in need of interrogating, you’ll find Intel often and it is always worth going out of your way to investigate it. Finding Intel allows you to reveal the locations of weapons, parts, resources, and Skill Points that are stashed around the district you are currently in. Taking the time to find Intel and unlock additional Skill Points is definitely worth the effort, so before any major mission, make sure to properly prepare by tracking them down. The enemy will fight more fiercely as you climb the ladder to the Boss of Bosses himself, El Sueño, so meet him head-on by getting you and your squad ready for anything.