When drafting your ideas for webpages, social media, images, etc., it can be helpful to look at these criteria to ensure that your draft/design can reach all people.
There are exceptions for many rules depending on the circumstances, but reading through the linked "Understanding Success Criterion XXX" can help with these issues.
____ Text contrast should be 4.5:1 from the background; large text must be 3:1. (1.4.3)
____ Text can be resized 200% without assistive technology with no loss of meaning and operation (1.4.4)
____ Users should be able to get to different parts of a website/page easily and through more than one link. (2.4.5)
____ Provide clear headings and labels on the webpage. (2.4.6)
____ Text contrast to the background must be 7:1; 4.5:1 for large text. (1.4.6)
____ For blocks of text, the foreground and background colors can be changed; line widths are <80 characters; alignment is not justified; line spacing is 1.5 within paragraphs and 2 between paragraphs; text sizes can change 200% without needing horizontal scrolling. (1.4.8)
____ Add section headings to the information given and be understood without problems. (2.4.10)
____ Content is designed and phrased so that words in specific contexts are explained within the text, including any cliches, idioms and terminology. (3.1.3)
____ Abbreviations are defined within the context, or with a glossary or drop-down text option. (3.1.4)
____ Text that has reading level higher than 9th grade, provides additional content or a version that is on the 9th reading level. (3.1.5)
____ Pronunciation help is provided if the context does not help the user understand the proper meaning. (3.1.6)