Cloudflare

Topic	Descriptiuon
Browser Cache TTL	The Browser Cache Time To Live (TTL) is the amount of time the end-users browser will cache a resource. This resource will be served from browser local cache until the TTL expires, after which the browser will request the asset again.
Security Levels	Security Level uses the IP reputation of a visitor to decide whether to present a Managed Challenge page. Once the visitor enters the correct Managed Challenge, they receive the appropriate website resources. An experienced website administrator that is confident in their security settings might set Security Level to Essentially Off or Low