Health Check:

As an admin, you can use Health Check to identify and fix potential vulnerabilities in your security settings, all from a single page. A summary score shows how your org measures against a security baseline, like the Salesforce Baseline Standard. You can upload up to five custom baselines to use instead of the Salesforce Baseline Standard.

Business Process Review :

The move to Lightning Experience is an opportunity to simplify and consolidate your business processes, address issues that are affecting user adoption, and otherwise clean house. As you evaluate your org for Lightning Experience, look for the places where you can make your users happier and more productive instead of simply moving over everything in your current implementation.