check this website : https://coinmarketcap.com/

You will find all the cryptocurrencies existing in the world now, the capitalisation of all of them is more than half trillion dollars and it grows everyday, almost the half is in bitcoin this why it's the most expensive, I visit that website everyday, you will know about the coin everything, markets where you can buy and sell, communities, charts and websites that they have, usually they are organized by the biggest capitalisation that they have but you can organize it by persents or suply or volume in 24 hours.

Learn about each coin in particular, register in those markets, read reviews about coins and about the markets, bacause any coin can also be fake or some people will try to sell you wind, such things happen in the cryto world also, be careful from scammers, tha mean people that want to steal your money.

Any way, even me I am in this world more than 3 years and I keep learning big it's really a huge world and a lot of information in it, I spends almost all the day with my computer, I read a lot and watch video and start to earn from each opportunity, so do like me and everything will be ok, + I will share everything I learn because I like to share so much, it make me feel useful. ☺