There are several Megathreads in this sub that can easily be accessed. Phone user can access these pages by bringing up the the side bar.
Edit: here is the visual guide to bring out the side bar

Here are a few Megathreads section and it's uses:
Weekly Trades & Giveaways: This page can be used if you are looking for a good account but don't want to do rerolling yourself and/or having a hard time pulling for the unit you want; This is for GL and JP; Updated weekly

Daily Help Thread: This page can be used for questions concerning the game itself, features, and errors; Both for JP and GL; Updated Daily

Daily Team Thread: This page is for help with Team composition and how to's with team setup and equipment loadout; For Both JP and GL; Updated Daily

Weekly Achievement & Progression: this page is where you can post your achievement ie i pulled a lightning. Posting Youtube videos of your pulls and whatnot.. in short Brag all day long, you will most likely not be downvoted their.. hopefully. Well you did enter that page expecting people with huge bragging rights so.. not really a reason to be salty..; Both GL and JP; Updated Weekly

Japan Friend Codes and Global Friend Codes: these pages are used to look for friends with units you want.. or to just make friends

FAQ : For frequently asked questions (doh!), my advice is to read this before the rest. You might have a question that might have been already answered in this page.

For Event pages: It is where you can find the Gacha rates of current banner units and Guides on how to beat trial bosses. It is frequently updated every start of a new banner/ event or trial.

Let's try and keep this sub a friendly place where new user will not have a hard time looking for answers :)

PS. Most Veteran user (I try to avoid using the word old, age related issue) like myself, Frequently visits these pages and help whenever we can. So you are most likely to find the answers you are looking for by just posting on those Megathreads.

Goodluck and Happy Grinding! May Lady luck bless us all :)

Blood-shot eyes, Sweaty thumbs and Salty tears have been shed
~Sephiroth_ffbe

Signing Out