Ever committed a folder that shouldn't be a GIT? e.g. node_modules, lib, vendor, etc. For my case with Jekyll, I committed _posts folder…

A hash is an associative array, which is pretty much an array with key-value pairs of which the keys are unique. In Ruby it can be denoted…

In order to rewrite history you need to use git rebase -i <commit_id>. This is useful for the following scenario deleting useless commit log…