I’m updating. I will put this post in the Helpful Links and Information sticky.

Planefag Tools

Public Flight Tracking: flightradar24.com
Military Flight Tracking: adsbexchange.com
Aircraft Incidents: aviation.globalincidentmap.com
FAA N-Number Inquiry: registry.faa.gov/aircraftinquiry/nnum_inquiry.aspx

Marine Codes
marineparents.com/downloads/CP04-AppdxB-Acronyms-Abbreviations.pdf