A mutable collection of useful learning resources compiled from my own experience, and suggestions from the fantastic F# community. PR's welcome :)
F# In action, by Isaac Abraham. 
Stylish F#, by Kit Eason. There is a second edition available of this. 
Domain Modeling Made Functional, by Scott Wlaschin 
Essential Functional First F#, by Ian Russell 
This book is currently Free on lean Pub. There are also youtube videos to accompany this book's content being added from Feb 24, for 12 weeks. See Essential Lectures. 
Get Programming with F#, by Isaac Abraham. 
Testing with F#, by Mikael Lundin 
The Book of F#, by Dave Fancher 
fsharpforfunandprofit.com - Scott Wlaschin 
Tour of F# - Microsoft 
Exercism.io - Code Kata’s. They also have a mentoring Track, where you submit your solutions and receive feedback from mentors. 
The F# Foundation - Lots of other resources to be found here, including links info on the F# Mentorship Programme, and how to sign up for the F# Slack 
F# Cheatsheet
F# Core Library Documentation - Microsoft/Community 
F# style guide - Microsoft/Community 
Amplifying F# - Community 
F# Weekly - Community
Scott Wlaschin 
Evelina Gabasova 
Isaac Abraham 
Gien 
Mark Seemann 
Gina Marie Maini 
Ian Russell 
Ambika Eshwar 
Sergey Tihon 
slime girl 
Pim 
Natalie 
Compositional IT 
Olya 
Dustin Moris 
Felienne 
Krzysztof Cieślak 
Lena Hall 
Paul Blasucci 
Ben Gobeil 
Natalie Perret 
Zaid Ajaj 
Roman Sachse 
Alexey Golub 
Don Syme - F# Language Creator 
amplifyingfsharp
The Dev Owl/Roman Sachse 
Zaid Ajaj 
Ben Gobeil 
Dave Thomas 
A series of YouTube videos to accompany The Essential Functional First F#, book by Ian Russell 
amplifyingfsharp - Essential Lectures 
Loads of Talks here: https://channel9.msdn.com/Events/dotnetConf/Focus-on-FSharp
F# From the Ground Up - Kit Eason
The Elmish Book By Zaid Ajaj. How to use the Fable compiler, "which will take our F# code and turn it into JavaScript"
Functional Programming in C# by Enrico Buonanno 
Language Extensions A nuget package to bring some Functional Style tools to your C# code.