Even if you've been around animals all your life, it's always a good idea to refresh your knowledge of petiquette! In addition to the tips below, here are some links to help you refresh your knowledge of pet body language, and some ideas for fun activities to try:
Speaking Dog (dog body language): http://www.ispeakdog.org/
Speaking Cat (cat body language): https://www.alleycat.org/resources/a-visual-guide-to-cat-body-language and https://www.cats.org.uk/help-and-advice/cat-behaviour/cat-body-language
Cat Enrichment Activities: https://resources.bestfriends.org/article/enrichment-ideas-activities-and-products-indoor-cats
Dog Enrichment Activities: https://www.aspca.org/pet-care/dog-care/canine-diy-enrichment
The Benefits of Sniff Walks: https://www.patriciamcconnell.com/theotherendoftheleash/take-your-dog-on-a-sniff