Before we start with the gameplay, let's talk about some important skills you (Lara) needs to work on/get upgraded!
These two should be upgraded and unlocked as soon as possible. Not only will these make your job much, much easier, as ammo, resources, etc. won't be as hard to come by. As a result, you no longer have to spend half an hour scavenging for things. Regardless, keep an eye out for orange trees, crates, chests and loot in general! Finfing these things, and tombs (can't forget the tombs :)) give you skill points, which you can use at camps to upgrade skills.
Now that we've talked about some important skills and tombs, let's talk about outfits! Lara has a cacophony of available outfits with which she can look stylish while kicking paramilitary butt. As you can see in the pictures above, she has many different outfits. These are unlocked by exploring new areas, meeting new people, buying DLCs, and exploring in general. Her outfits are nothing short of exceptional- they capture who she is in every waking moment, not to mention the rugged but modern looking vibe one gets from them. Not only do they add to the story, but they add to the experience. If the option to dress her as you wish were not available, lots of people would be disappointed.