- Use 301 redirects for top-priority pages that you want Google to index first. Use 302 redirects for lower-priority pages which can be indexed later.
- Use 301 redirects all the time. There are no proper use cases for 302 redirects.
- Use 301 redirects when the change is not permanent. Use 302 redirects when the old URL is moving permanently to the new URL.
- Use 301 redirects when the old URL is moving permanently to the new URL. Use 302 redirects when the change is not permanent.