If I want to volunteer online, where do I start?

If I had an extra hour or a few hours a day when I had free time, I wanted to help people online, something like support or something like that.

Why do I want this? The answer is: It brings me pleasure when I manage to help someone at least a little. And also when I listened to people on the Internet, just random people, they didn't even ask for help, I somehow instinctively felt that they had some kind of problems by the tone of their messages, and in the end I managed to cheer them up at least a little.