Posting on Twitter is simple. You just type in some text, attach an image, video or a GIF, and then send it. Done, now your tweet can be seen by everyone. It is also highly adjustable: you may make it so that only certain people can see your account. Twitter is very simple and you do not need to learn much before using it. Just remember to try and stay under the word limit and not write entire essays in a post.
Now, one thing that I do not like about Twitter is that you will most likely be ignored. Unlike Reddit where you can post something in a subreddit and everyone sorting by new will see it, no one can see your tweets unless they were retweeted (reposted) by someone or if that person follows your account. Due to this, starting out on Twitter may prove to be difficult for newcomers.
Twitter's moderation is also heavily flawed. There were several occasions when someone created an account and proceeded to report everyone for fun. Most of these reported people were banned or locked out of their accounts because their messages were taken out of context. That has happened in many Twitter communities and caused a lot of problems for many innocent people.
Overall, Twitter is a good social media. However, it can get boring fast. Sometimes you will just be ignored by people when you reply, and sometimes your friends can fall victim to a ban because their message happens out of context. I suggest that you try it out as it is a very popular social media for many different people, and is very simple (although, as I said before, trying to become "popular" may be hard).
Thanks for coming to my TED talk.