If someone or something is under the same roof as a dead body, if it becomes tamei.

the laws of tzara’as, including how it affects people, clothes, and houses.

how many mesechtos are in טְהָרוֹת

The laws of a Red Heifer

Covers general rules about how tumah is contracted and how it affects food and drink

 מִקְוָאוֹת

 This masechta talks about the tumah only a woman can get

This masechta discusses which liquids can make food tamei.

This masechta explains the tumah of a person who has an unusual discharge from their body.

This masechta talks about someone who went to the mikveh but still needs to wait until nightfall to be completely tahor.

This masechta talks about a special type of tumah that can affect hands.

This masechta explains how the stalks of fruits can sometimes carry tumah.