AEM hotfixes do not benefit from the same level of quality assurance as service packs or product releases, therefore must be always validated first on a staging environment as part of your quality deployment processes.

• You can access the Package Share with a registered user as mentioned here. 
  
• Request the other hot fixes via an AEM Support ticket.
  
• Most hot fixes are stand-alone unless specified and can be installed in any order. It can be self-verified by looking at "Details" tab Dependencies element in package share.  
• At the moment, the release notes of the public hot fixes are only available per request via the AEM Support Portal. Package Share will soon hold them directly.