No need to read 1500 pages of the NIST SP 800-53 Rev 5 artifacts to learn core cyber security requirements.  With NIST Notes desktop app, you can click through the 1007* security and privacy controls in the SP 800-53,  800-53B (baseline) and 800-53A(Assessment) cyber security framework artifacts in a matter of minutes, not hours.

NIST Notes desktop app combines all three artifacts into a single, user-friendly interface that provides a sample question, an example of a typical implementation and visual depiction of each control.  NIST Notes was created to assist cyber security professionals (ISSO, ISSM, SCA, Analyst) with assessing, validating and auditing the  implementation of security and privacy controls.  And with the ability to quickly search individual controls and  filter the controls based on impact-level, you can leave the hard-to-search PDFs and complex spreadsheets behind. NIST Notes is your new go-to-guide for NIST SP 800-53. 
*Rev 5 controls 1189 but 172 are categorized as withdrawn.