Reddit reviews Lettering & Type: Creating Letters and Designing Typefaces

I recommend the following books:

Thinking With Type by Ellen Lupton.
This book is the essential introduction to typography and probably should be the first type book you get.

Lettering and Type by Bruce Willen and Nolan Strals.
This book provides an introduction to different types of lettering and typographic work, as well as a brief introduction to designing your own typeface.

Designing Type by Karen Cheng.
This book covers the intricacies and design considerations of each letter one by one. It's a great reference when designing your own type, or even if you just want a more in-depth look at letterforms.

I like Lettering & Type: Creating Letters and Designing Typefaces and In Progress: See Inside a Lettering Artist's Sketchbook and Process, from Pencil to Vector. But really the biggest help for me was just daily practice, with someone who can give you quality feedback on your work