American Radio Relay League
http://www.arrl.org/about-arrl

ARRL is the national association for Amateur Radio in the US. Founded in 1914 by Hiram Percy Maxim as The American Radio Relay League, ARRL is a noncommercial organization of radio amateurs. ARRL numbers within its ranks the vast majority of active radio amateurs in the nation and has a proud history of achievement as the standard-bearer in amateur affairs. ARRL’s underpinnings as Amateur Radio’s witness, partner and forum are defined by five pillars: Public Service, Advocacy, Education, Technology, and Membership.

A bona fide interest in Amateur Radio is the only essential qualification of membership; an Amateur Radio license is not a prerequisite, although full voting membership is granted only to licensed radio amateurs in the US.

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Last year I attended my first ARRL Field Day and participated in several public service events in my region as a ham radio volunteer.

Besides ARRL, there are dozens of websites and YouTube channels related to ham radio, such as:

Callsign Database by QRZ.com
https://www.qrz.com/

SolarHam - Monitor Space Weather Data
http://www.solarham.net/

N5DUX Ham Resources
http://www.n5dux.com/ham/

FCC License Manager
https://wireless2.fcc.gov/UlsEntry/licManager/login.jsp

Log in to the License Manager to view and manage your licenses and applications, apply for a new license, and perform other license and application management tasks based on your FCC Registration Number (FRN). 10-digit FRN is required.

How to get started on 2 Meter FM. For the new hams.
K7AGE's YouTube Channel
https://www.youtube.com/playlist?list=PLY2usAi9v_NaK_K3z2d7oH6Lxrw7VbVYB