What's your best advice for communication in a relationship? Everyone says it's key, but what does everyone do to make sure it goes well?

Do you write out your thoughts and feelings? Do you make time to sit with your thoughts and feelings before bringing them up to your partner? How do you get them to understand your point of view when they struggle to understand or see it?
What's your best advice for communication in a relationship? Everyone says it's key, but what does everyone do to make sure it goes well?
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