When you start tinkering with a module or a theme in Drupal, eventually you’ll need to print a variable to see what’s inside.
Now in PHP you have var_dump and print_r but these functions aren’t the easiest to work with. When used they print the variable fully expanded, making it hard to filter or find anything.
In the Devel module for Drupal 7, you have the dpm and dsm which printed variables using the Krumo library. For Drupal 8, however, this library has been replaced with a more modern and maintained library called Kint.
Web Profiler, which ships with Devel, adds a toolbar at the bottom of each page and gives you stats about your Drupal site. Out-of-the-box, you get the number of queries, how much memory was used and so much more.
Learn how to get the most out of it by watching the video above or head over to the link below.