How can I communicate clearly and respectfully with someone of lower cognitive ability?

When communicating with someone who may have below-average cognitive ability or who has difficulty understanding basic social cues or everyday information, what are the most effective ways to communicate with them?

What strategies can be used to explain ideas more clearly, improve understanding, and help them consider different perspectives? How can complex concepts be broken down into simpler language without being disrespectful or patronising?

I am interested in learning practical communication techniques that promote understanding, patience, and respectful interaction with people who may process information more slowly or have difficulty interpreting social situations.
How can I communicate clearly and respectfully with someone of lower cognitive ability?
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