Color is extremely important. On the flipside, though, if you make poor color choices, it can create something aesthetically unpleasing or even impossible for your viewers to read.
Select your colors carefully:
Color contrast is an important way not only to ensure that your work is aesthetically pleasing, but that it can be viewed by any audience.
If color contrast is lacking, those standing at a distance may not be able to discern your content. If you use certain colors, those who are color blind may not be able to make it out at all.
Use your colors wisely:
Colors represent emotions and even actions. Think about ways that you could use this to your advantage! (Color Emotion Guide infographic)
Color can be a great way to group or delineate items in an infographic. Keeping the same 2-4 colors can also help create cohesion in your graphic.(Example of color use to group items in an infographic)
Fonts can convey meaning beyond the text they spell out. Think about it: what do you feel when someone texts you in all caps? If I say "scary Halloween font" does that bring up a mental image? Does the text in most of your books look the same? Why?
The biggest distinction when it comes to fonts is whether it should be used for headers or titles or body text. It's critically important that your body text be clear and easy-to-read. You have a little more freedom with your titles, but if your font is a script or is too narrow, you may have issues with color contrast between the font and the background image or color. Below there are several resources to help you select a title and body font that will work together beautifully.
The font choice goes hand-in-hand with sizing and spacing. The last resource below will be helpful for these aspects.