Bismillah Insha allah

1)Q) How to start PostgreSQL server in windows
pg_ctl -D "C:\Program Files\PostgreSQL\11\data" start

To stop the server
pg_ctl -D "C:\Program Files\PostgreSQL\11\data" stop
To restart the server:
pg_ctl -D "C:\Program Files\PostgreSQL\11\data" restart

Reference:
https://tableplus.io/blog/2018/10/how-to-start-stop-restart-postgresql-server.html