Warning after installation: Invalid argument supplied for foreach() in CRM_Utils_Check_Component_Env
The code in question is checking whether CiviCRM has updates available that you haven't installed yet.  If you've reached line 522, that means that CiviCRM has that info - possibly from checking https://latest.civicrm.org/ but more likely because it saved the results in version-msgs-cache.json.  However, the error is suggesting the info isn't present.

This could be a weird file permission issue, or perhaps a malformed version-msgs-cache.json.  If you know you're running the latest version of CiviCRM, I'd ignore this and see if it clears up when the cache expires (72 hours).  If you're not running the latest version, please edit your question with a) the CiviCRM version you're running, b) the contents of version-msgs-cache.json, which should be in your CiviCRM uploads folder.