Useful information resources:
Key mining concepts
This is a good article.
Legality of bitcoin by country or territory
List of blockchains and ICOs
These are different things! BLOCKCHAINS | ICOs
Price comparisons across different exchanges: Bitpicker.
Create virtual portfolio
List of tokens
LIST OF ICO resources
CURRENCIES/TOKENS TRADED BY DIFFERENT EXCHANGES
The mega-exchange where you can connect your accounts from all your exchanges is Coinigy.
Number of currencies traded by different exchanges: see this list.
In my experience, ANXPRO is the best exchange, with detailed security features and notifications for every transaction. Poloniex is FAR better than Coinbase in terms of features (e.g. it allows stop limit orders) but it DOES NOT provide any email notification, which is an issue. And it has some seriously bad reviews. Bittrex is a large exchange with a lot of coins (too many to list here).