Please tell me, how can I create a handwriting font from letters of the alphabet in a .jpg? I created the .jpg for calligraphr, but it won’t upload it).
You can use Fontself to convert your lettering into a vector font but will first have to vectorize your letters using Illustrator’s Live Trace features.
Have a look at these tutorials:
https://creativemarket.com/blog/how-to-create-your-first-font-from-scratch-a-step-by-step-guide