Good day! Who does advertising in telegram? Can you give some advice?

Telegram was just a messenger for me for a long time, until I started noticing how much advertising there was — and quite accurate. I wanted to figure out how it all works, and ran into a trivial problem: there is almost no information on the topic, especially on specific platforms and prices. As a result, I came across the article Where to buy Telegram Ads — it finally explains where to look for platforms, how everything works, and what pitfalls there may be. Useful if you want to test Telegram as a channel, but don’t know where to start.