Using a light colored font on a light colored background is just a bad idea. It is difficult to read. Every. Single. Time. Don't believe me?
The other mistake people make is putting text over an image in a header and having it blend together.
Consider using something with a mostly solid background.
Similar to using light colored fonts on a light colored background, using bright fonts on bright backgrounds is a definite no-no. I mean, look:
Like with neon, use bright fonts sparingly and never on a bright background.
Neon colors can be a fun addition to your website/guide, providing a pop of color that can draw a user's attention to important information. However, neons can also be very difficult to read and when used excessively, headache inducing. Consider:
Consider using neon colors sparingly and with smaller elements. Also think about removing some of the brightness for a darker, more muted look.
When highly saturated colors are paired, they create a “vibrating effect” where colors seem to almost move in a blurring or glowing motion. You don’t want to do this.
It is actually pretty easy to predict when colors will "vibrate".
A classic example of vibrating colors is the Christmas combination; bright red and green. Furthermore, vibrating colors also provide accessibility issues as they are undecipherable to people who suffer from color blindness.