Hello! We have a guides/info/tools/etc section on our discord (http://discord.gg/qQf5uDh) with a ton of information that gets updated daily. However, I know everyone isn't a fan of discord (That's OK!) or might prefer to have things here, so I figured I'd share some resources here as well (though joining the discord is recommended so you can ask questions and get help, and much more!).
General Tools
Website with guides/pages on most beginner/midgame PSO2 topics (and even some endgame ones!)
Translation differences between NA/JP, very useful for understanding JP resources
A skill simulator, perfect to showcase, share, and plan out skill tree builds
An affixing simulator, highly useful for planning how to upgrade weapons/units
English PSO2 wiki that can give information about items, enemies, weapons, etc.
Offers a wide range of information about grinding, gathering, and more
If you've found any useful resources for PSO2, please post them here so everyone can benefit. Thank you!