What is if i stop sharing my location will they know?

Whether or not they will know if you stop sharing your location depends on who "they" refers to. If "they" refers to people who you have shared your location with previously, such as friends or family members, then they will no longer be able to see your location if you stop sharing it.

However, if "they" refers to any entities that may have access to your location through your phone or other devices, such as tech companies or government agencies, stopping location sharing may not entirely prevent them from knowing your location. Some apps and services may continue to collect location data even if you have turned off location sharing. It is important to carefully review the privacy settings and terms of service for any apps or devices you use to minimize the sharing of your personal information.