The two books which I published (A RETIRED LAWYER'S DOOMED ROMANCE and ESCAPE FROM EVERYTHING) on KDP both use a Courier New Bold font. A commenter mentioned that she found the sample too difficult to read so she didn't download my romance book even though it is on the free download promotion. I looked over my books on my own Kindle and also other books which I have purchased which don't use the bold font. Both my wife and I preferred the bold font rather than the regular.
What do other authors think about which font to use?
I leave mine to the Kindle/reader to choose. I don't see it as being up to me to decide for them.
If you do want to choose a font, it's good practice to use a family rather than something specific. For example you might default to a serif family but use media queries to switch to a sans-serif family on devices with LCD screens. It's easier to read serif on printed material (which extends to e-ink) and sans-serif on back-lit displays.
Personally, I certainly wouldn't want to wade through an entire book that used a strengthened variant of Courier.
One of the features of ereaders is that they allow the reader to choose how the screen looks. By specifying bold text, you're taking away a chunk of choice, and most prefer to read a proportional font, so by specifying Courier, which is a monospaced font, you've taken away another chunk of choice. The reader you lost and found out about is probably only one of many who find Courier New Bold offputting. Learning this early may be the single biggest benefit you'll reap from your free days.
I personally would contemplate gouging one eye out with a dull grapefruit spoon than reading a long novel in any Courier font. Clearly, your mileage varies, but the display of your ebook is for your readers' benefit, not for yours. If your Kindle has the Courier setting (my Touch does, my Fire doesn't) , use it for your own reading and don't force it on the world. They'll choose it if they like it.
Courier has a very defined place in publishing: it makes it simple to estimate word count of a manuscript in standard format. It is never used for body text in print publishing, only for small graphic snippets meant to reflect a typewriter-typed passage, because it frankly isn't a highly readable font. If you really want to force this look into your ebook, don't be surprised if you find your sales are low: that reader just warned you that people don't even want it for free.
Don't embed fonts, not only for your readers' sake, but for not introducing strange errors into certain devices' displays. Let the reader pick.
In a side note, you might want to put a thin gray line around the edge of your cover (in photoshop speak, a 4 point stroke), because the cover elements are flying off into space because of the white background. (Or possibly rethink the white background.) The Look Inside widget introduces such a line and keeps it from blending into the page, but in a simple search, the cover is merging with the rest of the web page. It's not a professional look.
(Type your manuscript in your preferred font, but don't embed any font into your ebook: that overrides the choice options and raises license issues. There are some discussions in the formatting section about this: I think you'll find them useful.)
Type your manuscript in your preferred font, but don't embed any font into your ebook: that overrides the choice options and raises license issues. There are some discussions in the formatting section about this: I think you'll find them useful.
Times New Roman, single spaced, 12 pt for text and 14 pt for headings (in bold and all caps), not embedded; paragraph indent set to .375, works fine for me. Never had any problems.
New Times Roman was actually designed for the narrow columns of newspaper publishing so it's not the best on a Kindle. This can be adjusted with spacing and kerning but why bother with that if you don't have to? There are others that are similar in style and more loosely spaced to be a little easier on the eyes. I chose Georgia. The letters are a little wider, not so crammed together but very similar in style. Overall very pleasant to read.
Bold fonts are not popular with publishers. In fact, the rules of my former trad publisher prohibited the use of bold fonts in eBooks.
They had a stated reason for that prohibition, but I don't remember what it was.