Master Your Autofocus If You Want Sharper Images 

Brilliant Video! Deserves more likes.

great summary!

Chapters: 0:00 - Intro 0:21 - What is Autofocus in Photography? 1:09 - When to Use Autofocus in Photography 1:16 - How Does Autofocus Work? 1:41 - 1. Contrast 2:12 - 2. Active vs. Passive Autofocus 2:17 - Active Autofocus System 3:45 - Passive Autofocus System 4:07 - 3. Different Autofocus Systems 4:28 - Phase Detection AF 5:12 - Contrast-Detection AF 5:56 - Hybrid AF 6:50 - 4. Factors Impacting Autofocus 6:58 - Lighting 7:06 - Lens Speed 7:30 - Subject Contrast & Color 7:40 - Camera and Lens Compatibility 7:58 - Autofocus Modes in Photography 8:14 - 1. Single Autofocus Mode 8:34 - 2. Continuous Autofocus Mode 8:57 - 3. Hybrid Autofocus Mode 9:29 - Autofocus Area Modes 10:07 - 1. Single-Point AF 10:33 - 2. Dynamic Area AF 10:59 - 3. Group Area AF 11:23 - 4. Zone AF 11:46 - 5. Auto-Area AF 12:56 - Autofocus Scenarios 13:01 - 1. Portrait Photography Autofocus 13:28 - 2. Sports Photography Autofocus 13:51 - 3. Wildlife Photography Autofocus 14:13 - 4. Landscape Photography Autofocus 14:37 - 5. Event Photography Autofocus 15:05 - 6. Macro Photography Autofocus 15:30 - 7. Street Photography Autofocus 15:50 - 8. Astrophotography Autofocus 16:09 - Conclusion

Very in depth and great video. However in this era of modern mirrorless, there's no longer a need to change modes ever. With the latest Canon, Nikon, Sony bodies, one can just set a small tracking point with AF-C forever (even for landscapes). Changing modes only made sense back in the days when AF was still rather new and needed different settings/priorities to get the best results.