How to collect emails for sharing away, in GMail

a.k.a., for forwarding :)

Method 1: Forward under a common subject

• Define common subject for each email thread (ex., "FYI: Cyber magics").  Optionally assign label "++" to ease locating the mail thread later.
• Copy and paste into the thread's new reply and review appropriate recipients when send.

Method 2: Use label

Simply forward the email, and then assign label.  Here is recommendation: Tags for FYI & Forwarding.