usually beginners choose a popular exchange, because they follow the advice of people who have done it,
or maybe advice from social media and also YouTube, because I believe that before entering the world of cryptocurrency,
beginners will look for information first, and I recommend that is to register on Binance,
because Binance is the best exchange in the world besides Coinbase and Kraken.
Using advice from youtube or social media could be deadly for your profits. There are so many people online that want to make money so they suggest stuff to you that would make them more money, like get a low level coin and then suggest it to everyone if they have a good follower base, those followers buy and increase the price and that person sells and gets out. Basically this is more about how social media people can influence the world in the wrong way and that should not be the case for anyone.
I personally feel like it is quite acceptable to follow people on bitcointalk, even though we have people who are idiots here as well, we are a whole population and yes we do have ranks like legendary and sr.member and so forth but we do not have any followers or fame here, everyone comes in and says what they want to say and create a beautiful discussion and that is how it should be, it would give everyone a good idea.