Moving into a new to me apartment, what are good decorating tips for a new space?

Calm, tidy and no clutter are key notes for this one -
No roommates and I have one teen that I work full time and homeschool them.
I pay all my own bills and my new car and my kids clothes and lifestyle they like.
Coming home at the end of the day and on my weekends off, I enjoy being home all the time and relaxing
Moving into a new to me apartment, what are good decorating tips for a new space?
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