Returning player looking for resources?

Hello! Haven't played since the game in about 5 or 6 years now, and never properly learned the game. Was hoping to find a place with resources for most things, but the priority order for me would be

• Chain Shift explanation, haven't played yet as I just reinstalled the game so if this is available in a tutorial please ignore this point ☺️
• Explanation of character archetypes? Like one that would categorize them as a Zoner, Rush down, etc.
• Proper character guides for when I finally settle on one?
• Tier lists for tournament viability (I've never cared for tiers but it's still knowledge worth having)

Appreciate any and all help I can get!