I made a script.
It animates hair.
It's free.
*I have updated the script since posting this! Please check out the new features here:    • AFPHairRig v3.5 - Advanced techniques...  

Beginners beware, I'll be covering advanced techniques with expressions and skimming over the basics.

VIDEO BREAKDOWN
0:00 The problem with animation hair in AE

1:01 SCRIPT OVERVIEW
2:32 How to use AFPHairRig
6:11 layerIndex - Hair strand animation order
7:34 masterFreq - Speed up and slow down of all hair
9:45 Freq - Hair strand animation speed and loop
10:02 Amp - Hair strand bend power
10:18 FallOff - Hair strand bend power per bone (puppet pin)
11:36 Offset - Hair strand starting animation location
12:00 Delay - Hair strand bone offset (puppet pin)
12:37 WaveMath & PhaseLocator - Math needed for script animation
12:49 Subwave controller overview
14:30 MASTER_HR_Controller & GLOBAL_HR_Controller

15:36 ART BREAKUP
16:31 Separating hair from face
17:24 Painting back in the face
19:04 Separating hair strands from hair

21:45 ANIMATING HAIR
22:01 Importing art assets
22:25 Puppet pins and setup before running script
24:04 Running script & Null Bone structure
25:13 Fundamentals complete
28:15 Adding a gust of wind
31:43 Adding variance to loop
32:26 Animating other hair tufts
33:50 masterOffset - Hair starting animation location
34:40 Creating proxies to speed up render preview
34:56 Left hair tuft
36:24 How to use FallOff controller
37:33 Final steps

38:56 FINAL ANIMATION AND THOUGHTS

SCRIPT DOWNLOAD LOCATION (Script only supports After Effects 2015 and later in English. Note: you can change your After Effects language to English if you would like to use the script.)
AFPHairRig.jsx - https://anthonypossobon.com/download/...

DISCORD
Have questions? Join my discord and lets chat!
  / discord  

ART
Rockin art "Messy" by Ilya Kuvshinov
  / kuvshinov_ilya  
  / kuvshinov_ilya  

MUSIC
Diary of Ideas by VESHZA
Discover by VESHZA
The Turning Point by VESHZA
By My Side by K. Solis

SOFTWARE
Adobe After Effects (duh!)
Adobe Photoshop
Adobe Premiere Pro
Adobe Audition
Sublime Text Editor

WORKSTATION
AMD Ryzen Threadripper 2950X 3.5 GHz 16-Core Processor - https://amzn.to/2t2BSlj
64GB RAM G.SKILL - https://amzn.to/2GptDrd
GeForce GTX 1080 Ti SC Black Edition - https://amzn.to/2GaWe4h
2 1TB M.2 Samsung 970 PRO Series - https://amzn.to/2GoFF4u
X399 MSI Extended-ATX Motherboard - https://amzn.to/2TqO2Qx
Dell U3419w Ultrasharp 34-Inch - https://amzn.to/319EeP4

CAMERA GEAR
Sony a7S II - https://amzn.to/2MPcqJ8
Sony Distagon T FE 35mm f/1.4 ZA - https://amzn.to/2D73Lgz
Zeiss Batis 85mm f/1.8 - https://amzn.to/2MOweML
Rode NTG-2 Microphone - https://amzn.to/2WH13Yn
Viltrox L116T LED - https://amzn.to/2WJghvE
Kamerar D-Fuse Softbox - https://amzn.to/2tdzj01