Shakespeare Serif - an experimental font based on the First Folio
edent@open-source.social to 
shkspr.mobi
I've built a new font! Thoughts and feedback on my approach very welcome.
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edent@open-source.social to edent@open-source.social to
Do modern day fonts even support automatic ligatures? How does that work? Or are there Unicode symbols for them?
Both! Unicode has some support for as-is ligatures. For example
fiis U+FB01.Modern fonts can also use self-defined ligatures. That's how fonts like https://www.sansbullshitsans.com/
So my plan is (eventually) to add in ligatures where Unicode has defined them - and automatically replace typed text with self-defined ligatures where it doesn't.
Of course they do, better than ever actually. Google OpenType ligatures, for example. You can even use those on the web using CSS.
Some fonts have hundreds of different ligatures.
Yes, they do. Part of the OpenType standard are the so called “OpenType features” which (amongst other things) allow for contextual alternates, i.e. different kinds of ligatures, and for stylistic alternates, e.g. a slashed zero, a single-storey ɑ, etc. All of these different glyphs are encoded in the font and can be enabled when typesetting using different selectors. This website shows them off.
Some ligatures, like “ffl”, are a separate character in Unicode. Some were added because they can be considered a different character in languages other than English. Some (like “ffl”) were added because of legacy reasons; “no more will be encoded in any circumstances”.