The best way to share your availability from Google Calendar is with a booking link connected to that calendar: it shows only open slots and lets the other person book instantly, updating both calendars the moment they do. Google's own free/busy sharing only shows when you're open and still leaves them asking for a time, so save that for colleagues, not clients.
There are two different things people mean by sharing availability from Google Calendar. One is letting someone see when you are free or busy. The other is letting them book a time with you. They sound similar and solve very different problems, and reaching for the wrong one is why scheduling threads drag on.
Sharing free/busy visibility
Google Calendar lets you share your calendar with specific people at a free/busy level, so they can see when you are open without seeing event details. This is useful inside a team where colleagues schedule around each other. It is poor for clients: most do not use your calendar system, and seeing your gaps still leaves them to propose a time and wait for your reply.
The problem with see-my-gaps for clients
Even when someone can see you are free Thursday at 2, they still have to ask for it, you still have to confirm, and in the gap the slot might get taken. Visibility without booking is half a solution. It is the difference between showing someone the menu and letting them order.
Sharing a booking link instead
What clients actually want is to pick a time and be done. A booking link does that: it reads your Google Calendar so it only offers slots you are free, and the moment they choose, it is booked on both calendars with a confirmation. No proposing, no waiting, no double booking. This is the core of how online scheduling works and what booking links are for.
Keep your event details private
A booking link is also more private than calendar sharing. It shows open times only; what fills the rest of your day, and who with, is never visible. Schedulera reads only free and busy from your connected Google Calendar, so the booking page reveals availability and nothing else.
The short version
Share free/busy with colleagues who schedule around you. Share a booking link with clients who want to book you. For the second, claim a page, connect Google Calendar, and send one link instead of your calendar.