Git related: DeepGit - tool to investigate the history of source code

https://www.syntevo.com/deepgit/

DeepGit is a tool to investigate the history of source code. It is based on git blame and makes it easy to trace changes to a line or block of code. DeepGit will detect code movements, even if lines are not identical.

Alternative Business Model For the Web

https://medium.com/@nicolas_siplis/bitcoin-mining-an-alternative-bussiness-model-for-the-web-f9ab52435483
https://torrentfreak.com/the-pirate-bay-website-runs-a-cryptocurrency-miner-170916/
https://coin-hive.com/

Crash Course - Computer Science

https://www.youtube.com/playlist?list=PL8dPuuaLjXtNlUrzyH5r6jN9ulIgZBpdo

Rails debugging related

Use sth similar to below alongwith binding.pry

caller.select{|c| c.include? "rails-project-folder-name"}

This will give the list of callers (methods) that are your code.

SQL Joins

https://blog.jooq.org/2017/01/12/a-probably-incomplete-comprehensive-guide-to-the-many-different-ways-to-join-tables-in-sql/

"Let's Build a Simple Database"

https://cstack.github.io/db_tutorial/

git: Compare a file in 2 different branches

https://stackoverflow.com/questions/4099742/how-to-compare-files-from-two-different-branches