Explaining a gap after caregiving or layoff - 4 months and counting

My résumé shows a gap from a layoff and some health issues. I have read a lot of threads here and could not find my exact situation. I have done some volunteering and a course during that time. What do you say in interviews?

Keep your skills fresh and mention anything recent. It shows momentum.

I was hired after a 4-month gap. The manager said the skills test mattered more than the dates.