I'm sharing knowledge from blockchain course with you

I will show you my most popular blockchain sites and share some slides from JKU Linz Blockchain course with you!

https://blockchain.info/en/charts
... most trusted source for data on the bitcoin blockchain:
Mempool Size,
Transactions per day,
Mining Revenue and Costs,
Most popular addresses

Use case

Solidity

Try it yourself - learning how the blockchain works:
https://anders.com/blockchain/