BitLocker overview — by Microsoft Support

Describes the Account protection area of Windows Security, which shows your Microsoft account status and links to Windows Hello and Dynamic lock settings.

Device Encryption applies BitLocker protection on more devices than full BitLocker, including Windows Home. It turns on by default with a Microsoft or work/school account, while local accounts must enable it manually.

Describes potentially unwanted apps that sit between safe software and malware, such as ad-heavy programs, and how to reduce the risk and remove them.