Telegram is six years old! 🥳To celebrate, we locked six people in a room and gave them six hours to write this encyclopedia of Telegram (it took 24). https://telegram.org/blog/6-years
Not official but still informative
Check out: @teleposter!
Made by @jlelse. I'M NOT A TELEGRAM DEVELOPER NOR AM I A SUPPORT PERSON. PLEASE ONLY MESSAGE ME WITH TIPS OR WHEN IT'S REALLY NEEDED. THANKS!