I came across Tiago Forte, who has created various workflows and extensions from the foundation of GTD. Looks like he has streamlined all the different apps that people typically use: gmail; task manager (pocket informant, things 3, omnifocus, etc); Evernote; Notion, etc.
Here are some things I’ve done, newest to oldest:
-Added the email address to my gmail contacts, so I can send email directly to PocketInformant Inbox for processing into my Task Manager. I have multiple gmail accounts, so completed this for all of them. Theoretically, I should have one portal for all gmail/email accounts, but I haven’t quite done this yet. It’s relatively easy on iPhone to view ALL email accounts, though.
-Reading the first webpage — hhttps://fortelabs.co/start-here/