These are a couple of the resources that helped me get into the comp scene. Depending on how many and what kind of resources you add you might want to add a table of contents or divide up resources based on type. Like weapon/role-specific stuff vs objective oriented content.
Go through it and pick and choose what you like though. Some of this can be a bit dense.
The Woomy Bible Aka The Fluid Priorities and Roles document (still applicable to Splat 3): the starting point for understanding Splatoon's roles, objectives, and game states
docs.google.com
The Fundamentals Series by flc: Great 4 part series that breaks down objective of each ranked game mode. Might be out of order.
Twitch is the world's leading video platform and community for gamers.
www.twitch.tv
Twitch is the world's leading video platform and community for gamers.
www.twitch.tv
Twitch is the world's leading video platform and community for gamers.
www.twitch.tv
Squid School ft Ren Combat series: An AMAZING 3 part series for learning the micro of Splatoon's combat, especially for skirmisher/slayers. The first video is a must watch.
Community Callouts: Common call outs for Splat 3 maps.
drive.google.com
Devvy's backline positions: A good starting point to understand how to position as backline. Going into Recon and assessing the sightlines of these positions helped me understand backlining.
drive.google.com
Aim Drills for chargers: self explanatory
And finally, but most importantly, the Splatoon wrist exercises/warm-ups
Image wristexercises hosted in ImgBB
ibb.co