Fstoppers. A Complete Guide to Retouching Portraits in Photoshop for Free

[Malcolm Ming]

Worth looking at if you're into portraiture.  
Handy to have it all in one place and it's at a good price:  FREE.
https://fstoppers.com/bts/complete-guide-retouching-portraits-photoshop-free-98236

[Chris Sawyer]

Thanks for posting the tips and videos covering post-processing of portrait photographs.  I can now remove all the pimples, crows-feet, moles, blotches, red-noses, etc when entering my Christmas portraits for the competition on 19th January!

[Alan Graham]

Chris are you going for the baby-faced Santa look then...