This is where you find links, presentations and whatnot.
Typeworkshop - Basics
MyFonts - Basics
Diacritics
More Diacritics(free book/PDF)
Polish diacritics
Icelandic
Icelandic 2
Vietnamese Diacritics
Sharp S
Cyrillic letter 'б'
Greek Type Design Resources
Greek Guide
Devanagari Guide
FileFormat.info – Check glyphs in alot of different fonts
Stringmaker
Spacing methods in seriffed and sans-serif typeface designs
HT Letterspacer – Tool for spacing fonts(Glyphs)
Tips on kerning/spacing workflow
Good text to test kerning
Introduction to opentype features
OpenType Features CookBook
List of available features
Visual overview
Advanced fraction implementation - by Tal Leming
Roman Numerals (Igor Freiberger)
Impallari test tool
Pangrams
Just Another Test Text Generator
Glyph Gazer - Compare glyphs in different fonts
Latin Plus Langauge Support validation
An Crúbadán Database of word lists of languages (including minority)
Waterfall by Mass-Driver Drop a font and get a list of words wit hthe same width.
Vertical Metrics - See how the three different vertical metrics behave(Repo)
TDi 2016
Crafting Type
TypeParis
Mekkablue (100+ scripts)
schriftgestalt - Set Kerning Groups etc.
Glyphs App tutorial (3-part) - Good introduction even if you dont use Glyphs.
Brace Trick (Glyphs App)
Google Fonts Glyph Set Baseline 2016
Charset Builder