If we need to highlight or emphasize text within a block, we should use bold or underline, as italics are harder to read.
I think this is extremely helpful in elementary classes specifically to bold or underline key details because children are just starting to learn how to take notes. If we bold what is most important, it makes it easier on them and trains their brains to not record every minor detail.
We should avoid the use of fonts with unusual features or ones that might distort when printed or copied. These include fonts with fine lines or a mix of thick and thin lines; those with small internal spaces, such as the openings in a lowercase “b” or “d,” as these might fill in when printed or photocopied
I feel like often times I am most appealed towards the decorative posters, even though the font can make it hard to read. This reminds me also of when teachers put a ton of posters in their kindergarten or pre-k classroom despite their kids not being able to read. It just creates clutter and can be overstimulating to a lot of kids.
Coherence Principle: Omit unneeded words, sounds, and graphics. Contiguity Principle: Place printed words next to the corresponding part of a graphic (see Figure 11.1 and Figure 11.2 for examples). Redundancy Principle: Do not duplicate audio and on-screen text.
I've found that these principles are even helpful for me in college classes. Specifically in slide presentations or long lectures where I feel like professors are often stating unnecessary information. I also prefer simple, straight to the point text