[A few words about blockchain developers
First you need to learn a web programming language like PHP or JSP so that you can exchange information in JSON-RPC with the node of a coin. Then you need to decide which Coin's Blockchain you want to work on. If you go to the website of your favorite Coin and see their Developer Documentation, you will understand what you need to do by calling Function. Two books by Andreas Antonopoulos to be a blockchain developer ...


1. https://github.com/bitcoinbook/bitcoinbook
2. https://github.com/ethereumbook/ethereumbook



You can read it for free on Github. Linked. If you have skills in Bitcoin and Ethereum Blockchain, it will be convenient for you to work in other Coins.