If your website or mobile app allows users to create content and make that content public to other users, a Content section will inform users that they own the rights to the content they have created. The "Content" clause usually mentions that users must give you (the website or mobile app developer) a license so that you can share this content on your website/mobile app and to make it available to other users.
Because the content created by users is public to other users, a DMCA notice clause (or Copyright Infringement ) section is helpful to inform users and copyright authors that, if any content is found to be a copyright infringement, you will respond to any DMCA takedown notices received and you will take down the content.
A Limit What Users Can Do clause can inform users that by agreeing to use your service, they're also agreeing to not do certain things. This can be part of a very long and thorough list in your Terms and Conditions agreements so as to encompass the most amount of negative uses.