Personal goes on my gmail calendar, anything work-related goes on my work calendar. If I have a personal thing (like a doctor's appointment) on my gmail calendar, I invite my work email address so it shows up on both. I use Calendly, and that way it properly shows my availabiltiy. (I know Calendly can check multiple calendars, but not everything on my personal calendar actually affects my availabiltiy, since my husband also adds work things to a calendar we share).