Machine names are all over the place in Drupal 7. When you create a content type or field it will appear next to the label. The concept of a machine name is simple.

Display Suite is one of the essential modules which I use on every project.

Search API has been my go-to module for building search pages for the last two years.

View modes allow site builders to display the same piece of content in various ways. Drupal ships with a bunch of them out of the box like Teaser, "Full content", RSS and much more.