Hi and welcome to the forum!

I'll try to help you as best I can here, but check out my videos, as they will also contain many answers to other questions you may have.

T11 stands for Top 11 as you probably figured out.

Other key abbreviations:

3*,4* etc. number of star player
Scout: 6 star player
Scout List: The list of 50+ token players
451V, 433, Hexagon, ND, etc.: Various formations, just learn the pattern and it's easy to recognize. Check table of counter formations
Token Buyer: Someone who buys lots of tokens
Farming: Watching ads, downloading aps to earn tokens/boosters
Scout Team: A team of all 6 star+ players
x9/x4: A max rated player for that star level
CL: Champions League
TC: Triple Crown
SA: Special Ability
FK, CS, AD, DW etc.: Various special abilities, there are 11 total (watch my video to learn all about them)
Green: Stamina booster
Blue: Morale Booster
Red: Health Pack
T: Token
35T Team: A team which earns only 35 tokens per season, no farming or buying
$: Money
2x corner: When the game award a second consecutive corner, which is a 95% goal
DC,DL etc: positions
Cones: Training points
Troll: When you lose to a much weaker team

These should be enough to get you started.