There are several ways to find a user's chat id in Telegram. In this post, I will show you a method commonly used by myself and Telegram users
When you search by typing 'Get My ChatID' in the search tab in Telegram, Bot will appear in the search results. Login to /start the bot and in return the bot will send you your chat_id
How to find a Group chat id in Telegram?
In Telegram, you need to add the 'Get My ChatID' I mentioned above to the group you want to learn the chat id of, and then you need to be an admin and then send the start message, in return the bot will send the group chat id