Monster Cards is, at the time of writing, a very new game. This guide will be updated as newer Monster Cards versions are released and I will always try to keep up with the newest standards, resources, and information whenever possible. With that said I have tried my best to compile any resources I can find to help provide players with cards, decks, beginner guides, and formats. If you feel that you have access to valuable resources which you want to share with the community, then go ahead and contact me so that those resources can be added to this and future versions of this guide.

Thurhame's Guide: Rules, Beginner Learning, and English Reference Guide
Thurhame can be credited for making the first English Steam guide for this game, it is a quick and effective beginner guide which features all of the same tables present on the official Monster Cards website including skill descriptions. This guide is an amazing resource for new players who don't want to keep the official site open while making cards. It also helps significantly by being the easiest to access English version of the game guide, as most other versions are in Japanese and require translation plugins to read.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2858901706

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The Official Discord: Match Finding and Card Sharing
The official Discord is by far the best place to find matches and ask questions about the game, it features a card sharing channel and "Looking for Game" roles/pings to assist in finding matches quickly at any time:
https://discord.gg/WwhP2XRBen

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Rose Halberd Discord: Competitive Play, Forums, and Card Sharing
Second to the official Discord is the Rose Halberd Discord, although not completely Monster Cards focused, it does feature a Monster Cards forum channel and rough on-ramp guide. It has a strong community for card sharing and at the time of writing is also preparing unofficial tournament formats for Monster Cards to begin holding competitions.
https://discord.gg/Hg7HpDy

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Monster Cards Website: Newest Updates and Official Resources
Finally I of course have to mention the official Monster Cards website, it is sadly in Japanese but with the use of a translation plugin in your browser you will be able to access it just about as well as anyone else. While other guides will always take time to update, the official site will always feature the latest patch-notes, abilities, and updates.
https://gasai.dev/monster_cards_wiki