In summary: You earn money faster, but at the same time you lost money faster; especially when using leverage. It's completely up to you if you're willing to do such high risk trades or not.
Oh and lastly, a huge majority of traders actually lose money.
The above just says it all! You can learn them all and apply them yourself. Only in this manner you will be able to know for yourself which ones you like or dislike.
People on here can suggest different types of trading that suits them but it won't necessarily mean it will suit you also.
The pros of learning them is that you'll increase your knowledge and be better equipped to be making trading decisions the downside is that you may lose money during the learning process.