Any work that you want to keep preserved, findable and usable is work that you can share: journal articles, chapters, essays, presentations, code, data, instructional material, etc. 

Some disciplines have specialized repositories. 

Important criteria for a repository: 

• Does it seem well used? Is the content academic or appropriate for your item type?
• Does it give you a DOI?
• Is it non-profit? 

You can always ask us what repository you should use.

This depends on the item, and your rights to share that item. 

Journal articles/conference papers: This varies by journal/proceedings, but most now allow you to post a preprint. If you (or any author) is a UC employee, you can post the peer-reviewed manuscript with the Open Access Policy, and the journal may allow everyone to do that anyway.

For more: UC Open Access Policy   |    Posting permissions by Journal or Publisher

Book chapter: Pay attention to the license you sign. Ask if you can post your manuscript in eScholarship.

Your code, data, presentations, etc are generally yours to upload.

Creative Commons (CC) is a licensing structure academics can use to make plain how work can be credited and reused. Many repositories you upload your work to may use a specific CC license, or give you a choice. We can help you choose a CC license.