This tool is now one of the most demanding test tools in the parket. UntimateQA is offering a free course on applitools. All folks who are currently working on Selenium should undergo thos course.
Link to course: https://courses.ultimateqa.com/courses/applitools (website seems still under development, but you can enroll the course)

Training Content

Part 1: Getting started

• 00-Course overview
• Course prerequisites
• 03 Course syllabus
• How to download and install Visual Studio
• Create Applitools account and install Nuget packages
• Why must we automate visual testing
• Benefits of Applitools

Part 2: Baselines and Dashboard

• What is a baseline in Applitools
• 01-Code overview
• 02-Baseline examples
• 03 1st comparison
• 04 Zooming, resizing and layers
• 05 Toggling and Floating region

Part 3: Match Levels and Regions

• 01 Exact match level
• 02 Strict match level
• 03 Content match level
• 04 Layout match level
• 05 Introduction to Ignore regions
• 06 Ignore regions in code
• 07 Ignoring multiple regions
• 08 Floating region
• 09 Strict region
• 10 Content region
• 11 Layout region

Part 4: Test Manager

• 01 Test Manager UI
• 02 Batches
• 03 Full page screenshots with CSS stitch
• 04 CSS stitching vs standard scroll
• 04 Bugs and test steps in UI
• 05 Test steps code
• 07 Fluent API
• 08 How programatic regions look
• 09 Conclusions