F8 will record a demo.
Getting flag and scoring in CTF is really nothing special. When you cap, it's the whole team's effort. Killing opponents so one can grab the flag, protecting the flag carrier, clearing your own base while someone else is getting the flag and so on. Getting caps basically means nothing because often the others are doing most of the work. Of course sometimes you get triple/multi kills and such and get some nice caps but generally speaking capping is not something to be proud of.
But you are still new and it's not that obvious. Still good to see you are enjoying the game.