You can access Trailhead at https://trailhead.salesforce.com/    Log in using your Salesforce ID, and you'll be able to learn most anything you can imagine related to Salesforce

Trailhead breaks learning down into 'trails' - which cover a number of modules that lead you through learning anything you want to understand about Salesforce.  If you're new to Salesforce, you might start with the Admin Beginner Trail.

Each "Trail" is broken down into "Modules" that in turn are broken down into individual units (that take from 10 - 30 minutes or so).  Completing a module earns you a 'badge' and your progress along the trail and in each module is saved and tracked.

8 hrs and 35 minutes sounds like a huge time commitment -- but if you budget time for two or three thirty minute sessions each week - your Salesforce knowledge will grow and grow!   The lessons are fun - interactive - and end with either a quiz or a hands-on-exercise (which you complete in a free, trailhead playground so as not to clutter up your production instance.   It's learning made fun.

You can also search Trailhead for specific topics - and just pick and use which units or modules you want to pick up skills on!  

Here's the first module in the Admin Beginner Trail:   Salesforce Platform Basics:

Have fun! And start using Trailhead.

We'll provide occasional links to relevant trails in our HandsOn Connect documentation!