Follow the official social networks can be of great help in maintaining information about the game.

Website: https://crema.gg/games/temtem/
There you can read the latest news and patch notes.

Twitter https://twitter.com/playtemtem
Great for breaking news and some memes in the development.

Discord Server: https://discord.gg/temtem
Be a part of a growing community, discuss the game and its development, share your pictures and creations, talk directly with the developers and participate in the community contests and feedback rounds.

Reddit: https://www.reddit.com/r/PlayTemtem/
Focused on fan content and memes.

Instagram: https://www.instagram.com/playtemtem/
Facebook: https://www.facebook.com/PlayTemtem/

Of course, I couldn't miss this one. An official wiki is a great help for any type of content related to the game. There you can read and understand everything about Temtem, written and maintained by the players.

Temtem Wiki: https://temtem.gamepedia.com/Temtem_Wiki

A document that can help those who came from Pokémon, linking terms between games and comparing them.

Temtem Reference Document: https://docs.google.com/spreadsheets/d/12vuI6FkvZP4u7UI11aX3EWeChFbTHSMQcLPDkdku2QY/edit#gid=0

Interested in a team building and sharing tool for Temtem? Well, here is. TemTeam is a competitive Temtem team building and sharing, that can also show you the type charts and the egg technique parents.

TemTeam: https://tem.team/

You can have the Tempedia on your PC and cellphone too! List of all Temtem with information about stats, moves, locations, weaknesses, breeding & evolutions.

Tempedia: https://tempedia.com/
Tempedia App for Android: https://play.google.com/store/apps/details?id=com.Tiborius.TemPedia&hl=pt_BR
Not available on iOS yet.

Temtactics is a Database, Tier List, and Guide for Temtem.

Temtatics: https://temtactics.gg/

A battle calculator to help you to improve your strategies.

TesTem: http://fellowtamers.com/TesTem/

Another datebase. All the relevant information on every Temtem, a Technique encyclopedia, breeding calculator etc.

TemLab: https://docs.google.com/spreadsheets/d/13PQVPGBKwWvLh-2VxBF6ktcdobIcImuUaJIfsDQYSFw/edit#gid=1954240740

SVs, TVs, Base Stats and Stat Totals by Volmer
Temtem Traits and Conditions by Volmer

Please, you can put in the comments below! I would be very grateful, it is a good way to improve the guide and help the community, maybe you can be a collaborator!