I watched hundreds of hours of planner explanation videos. Here are the best ones that show you details of page layouts and cover all the basics.
Hobonichi
Travelers Notebook
Take a Note
Jibun Techo
Sterling Ink Common Planner
Kokuyo Bushimen PAL Planner
Midori Hibino
Bullet Journal
Roterfaden
Midori Double Schedule
The Double Schedule planners are a collection of B6 planners that each feature a monthly layout and one alternative layout, so you have two views for each month. There isn’t a ton of content in English that I could find about these planners, but I purchased the Progression version from Yoseka on recommendation from Amy. It features a 30-day Gantt chart layout, which is nice for project and team capacity planning.

Wonderland 222
Plotter & Filofax
Happy Planner
Happy Planner is a disc bound system that enables a high level of customization. I will confess I don’t watch many videos about this so I don’t know what the best explanation for the system is yet, will hunt for one (and welcome suggestions! Find me on IG at @gemcha0s). But the community is large and there is tons of content out there.
Erin Condren
Erin Condren planners are spiral bound and chunky like Happy Planners, I also have limited knowledge about these.
