Fundamental design principles for non-designers

Weight: same as with Size, only put elements next to each other that are either exactly the same weight, or a considerably different weight. Things to stick to once you have selected them:
Typeface/font
Colour palette/shade of colour
Grid
Alignment
Style of decorative elements

And so on…
Placeholder text courtesy of Batman IpsumWhen you are working on many different pieces that appear next to each other (for example, video thumbnails for your YouTube channel, or covers for your Medium articles), choose one overall style for all of them and stick to it as well. Ignore the proximity rule at your own perilElements of a design should have less space between each other than between those elements and the edges of the composition.

Source: medium.freecodecamp.org