Reading and writing data to the Ethereum blockchain is very easy -see how in these two new articles

Two articles to learn about cryptostuff, blockchains, web3.0, and programming, all at the same time:

First, how to write data (disclaimer: you’ll need to spend some money as Ethereum):

Article 1: How to easily post data in the Ethereum blockchain network forever -with no programming

And then an article on how to read data (no need to spend money for this):

Article 2: Read Public Messages from the Ethereum Network with Simple Web Programming