Spoiler: A little background
Ever since the wee grades I have been super into maps, and more specifically, drawing them. My friends and I would often draw maps and give them perhaps the most general details, but we never really made them into anything beyond a picture. To this day, I begin my world building attempts with a map, and I very rarely get to much beyond that, much to my chagrin. However, I recently read "Kobold Guide to Worldbuilding" which included a chapter on this very subject. This chapter (written beautifully by Jonathon Roberts) helped me understand not only why maps are so important when creating a world, but also how to do them well. This book was awesome in so many ways, but it definitely helped me with my map-making capabilities specifically.
I don't know if all you world-builder's share this love of map making with me, but if you want help with this part of your world building project, I would love to provide. Making maps for an explicit purpose is much more enjoyable then simply making a coastline that festers away in a folder forever.
I use a few different free softwares when I make maps on my own, but I am open to others.
Here are some different maps of mine in various stages of development, made with different programs.
Spoiler: Made using Inkarnate
Spoiler: Made using Microsoft Paint