Vim resources

Installation and documentation

https://github.com/vim/vim — official Vim repository
:h usr_90.txt — user manual for installation, common issues, upgrading, uninstallation, etc
vimhelp: help.txt — HTML version of the Vim help pages like 'Getting Started', 'Editing Effectively', reference manuals, etc
vimhelp: quickref.txt — Overview of the most common commands you will use
vimhelp: vim_faq.txt — created from the questions and answers posted to the vim@vim.org user mailing list and the comp.editors newsgroup

After installation, use vimtutor (or gvimtutor) command for a "30-minute tutorial that teaches the most basic Vim functionality hands-on".

Text Tutorials

Vim primer — learn Vim in a way that will stay with you for life
Vim galore — everything you need to know about Vim
Learn Vim progressively — short introduction that covers a lot
Vim from the ground up — article series for beginners to expert users

Books

Vim Reference Guide — my ebook, suitable for beginner to intermediate level users
Practical Vim — published 2015, updated for Vim 8 in 2017
Mastering Vim Quickly — first published 2017
Learn Vimscript the Hard Way — customize vim, plugins and more, written for Vim 7.3
Vim book by Steve Oualline — published 2007

Interactive learning

vimtutor-sequel — advanced lessons
OpenVim — interactive tutorial
Vim Adventures — learn Vim by playing a game
Learn vim and learn it fast — interactive lessons designed to help you get better at Vim faster

Cheatsheets

Cheatsheet in multiple languages — shows up as embedded content in DuckDuckGo search as well
devhints: Vim cheatsheet
devhints: Vimscript cheatsheet
shortcutfoo — has nice animation for some of the shortcuts

Customizing Vim

vi.stackexchange: What is the Vim8 package feature and how should I use it?
Awesome Vim plugins
Vim as IDE
stackoverflow: Switching between files rapidly using vanilla Vim
How to Do 90% of What Plugins Do (With Just Vim)
Using template files — templates or skeletons, allow you to specify a template to be used for new files with a certain extension
Using Vim's abbreviations — automate things in insert mode
vim-bootstrap — provides a simple method of generating a .vimrc based on programming languages you use

Tips and Tricks

vi.stackexchange: Navigating Vim's documentation
stackoverflow: How do I find out what a vim command does?
vi.stackexchange: How do I debug my vimrc file?
stackoverflow: What is your most productive shortcut with Vim? — top answer is one of the best presentation on the capabilities of vi
stackoverflow: tips and tricks thread
50 Useful Vim Commands
Q&A on stackoverflow sorted by votes
Q&A on vi.stackexchange sorted by votes
Vim tips and tricks thread at /r/vim
Vim's built-in completion mechanisms (video) — let Vim do the typing, writing fewer typos and faster
Comprehensive illustration of navigating modes
stackoverflow: Save and restore multiple different sessions
Vimcasts — 76 free screencasts and 52 articles

Further Reading

VimGolf — Real Vim ninjas count every keystroke
Awesome Vim — plugins organized by section
Why use vim
Why Vim Is More than Just an Editor
Built-in man pager in Vim
Things about vim I wish I knew earlier
Tabs vs Buffers
Where Vim Came From and Understanding the Origins and the Evolution of Vi & Vim

Forums

Read instructions provided by respective forums before asking a question. Try solving it yourself before asking — searching online, manual, ask a colleague, etc.