Whenever you say 7th house, Is it based on Lagnam or is it Tula raashi always?

Guruvu Garu, Whenever you say 7th house, Is it based on Lagnam or is it Tula raashi always?

r9VTM_ZscRQ https://www.youtube.com/watch?v=r9VTM_ZscRQ https://www.youtube.com/watch?v=r9VTM_ZscRQ