These are the my go to Lightroom Classic Short-Cuts for my Mac. I usually update the list every year or so as my experience with Lightroom Changes.

Photo Information

1. Hit the i key to toggle the info displayed at the top left of the Photo

2. K for Keywords

Library View to Develop Module

1. Jump to Library Module Grid View: G

2. Jump to Develop Module: D

Import/Exporting

1. Import: Shift - Command - I

2. Export: Shift - Command - E

3. Export to Photoshop - Shift - Command-E

Panels:

1. Top Panel: F5

2. Filmstrip: F6

3. Left Panel: F7

4. Right Panel F8

5. All Panels: Shift-Tab

Before and After 

1. Before/After: Backslash Key \

2. Side by Side Before/After: Y

3. Split Before/After: Shift-Y

Crop Tool 

1. Open Crop Tool: R

2. Change Cursor to Angle Tool: Hold in Command

Graduated & Radial Filter 

1. Open Graduated Filter: M

2. Open Radial Filter: Shift - M

Brush Size

1. Increase brush size [

2. Decrease brush size ]