Hi, we are using some Remote site settings in my org for establishing the connection. There is a checkbox named as Disable Protocol Security. What will happen if i unchecked that checkbox. I read those documents provided by salesforce, those are talking about some security implications. I didnt understood what are those, can anyone explain me what are those security implications.

"Reports and Dashboard Settings" should be "Reports and Dashboards Settings" in the page linked below. The missing S means nothing shows up in the Quick Find results. 

https://trailhead.salesforce.com/trails/force_com_admin_beginner/modules/lex_implementation_reports_dashboards/units/lex_implementation_reports_dashboards_using_report_builder

The trailhead: Importing Data - Challenge keeps failing - see error message

There was an unhandled exception. Please reference ID: KMOEAQSC. Error: Faraday::ClientError. Message: INVALID_FIELD: SELECT Name, Id from Contact where Email LIKE '%example.com' ^ ERROR at Row:1:Column:36 encrypted field 'Email' cannot be filtered in a query call

I have disabled encryption and un-encrypted the "email" fields.  

How can I get around this error?  Or should I just spin up a new Dev Org?

"Reports and Dashboard Settings" should be "Reports and Dashboards Settings" in the page linked below. The missing S means nothing shows up in the Quick Find results. 

https://trailhead.salesforce.com/trails/force_com_admin_beginner/modules/lex_implementation_reports_dashboards/units/lex_implementation_reports_dashboards_using_report_builder