anyone can share how to set a reminder like 10min before any meetings from the team's calendar.

Hi Felicia770 

By default if the Teams Meeting is schedule through Outlook we should be able to set the reminder on the Teams Meeting before the start of meeting 5-10-15 mins before the start of Teams Meeting. This is a by default feature of Outlook based on the settings.

Unfortunately we do not have an option to set the reminder while scheduling the Team Meeting from the Teams Client. 

Scheduling Teams Meeting through Teams Client 

https://support.office.com/en-us/article/schedule-a-meeting-in-teams-943507a9-8583-4c58-b5d2-8ec8265e04e5

Scheduling Teams Meeting through Outlook Client 

https://support.office.com/en-us/article/schedule-a-teams-meeting-from-outlook-883cc15c-580f-441a-92ea-0992c00a9b0f

With Regards,

Satish U