How to create multiselect facets and partial word searches with Facet API, Search API and Search API Database Search.
Better Exposed Filters module improves exposed filters in Views.
How to set up indication for different environments (like dev, test and live) with Which Environment module.
How to create aliases using .bat files and .gitconfig file.
If you merge branches that edit same lines of code, you get conflicts that must be solved.
If you want to test something, add a feature or fix issues, branches are your friends.
How to transfer content from Drupal 6 to Drupal 7 using migrate and migrate_d2d modules.
How to update Drupal core safely and rollback to previous version if needed.
How to clone sites locally and pull changes from the remote repository.