What’s the best way to mark or tag a contact to make searchable?

Thanks for the video Paul… Question: What’s the best way to mark or tag a contact to make searchable? I looking to use my Zoho database across several different businesses ran by both my wife and I. Is that recommended? TY

Youtube

Yeah just tag them and filter your views. Or create a custom field for Customer Type if you want to too. Both are easy.
Here’s a video on Segmenting your contact list.