Most of my letters are typed using Times New Roman.
For designing posters, etc, I like the various versions of Arial for the main text.
I also use Bookman Old Style and Bookman Antiqua quite a lot.
For cursive fonts, I use Brush Script MT and Handscript SF.
I use a lovely little program which, with one click on my taskbar, lets me view all of the fonts which are installed on my computer:
http://www.styopkin.com/details_free_and_easy_fonts_viewer.html
(That page hasn't been updated for ages and only refers to the software running in Windows XP, 2000 and Vista but it runs just as well in Windows 7 and I'd be very surprised, given its simplicity, if it didn't also run in Windows 8 & 10).