Keyboard shortcuts not working on Mac (DaVInci Resolve 18)

Hello! I am new to video editing and I just followed the first two tutorials on the Blackmagicdesign website. I have noticed that not all keyboard shortcuts are working on my computer. I have a Macbook Air with the latest update (macOS Monterey 12.6.3). I am using the default keyboard version.
Some of the shortcuts that do not work:
- Playback: ⌥/
- Custom zoom in: the tutorial says ⌘= but it's ⌘+ on my computer
- Add one frame: the . does not work (but the remove one frame shortcut works!)
- Shuffle insert edit: ⇧⌘. does not work, but ⇧⌘, does
- Increase audio by 1dB: ⌥⌘=
I have also noticed that I can use the F9 F10 and F11 shortcuts without changing the keyboard settings by pressing the function key with them.
Am I doing something wrong?

Some of the shortcuts that do not work:
- Playback: ⌥/

The default keybinding for Playback is Space.

⌥/ is the default keybinding for Play In to Out, which requires a Range.

- Custom zoom in: the tutorial says ⌘= but it's ⌘+ on my computer

Zoom In has both ⌘= and ⌘+ keybindings assigned to it.

- Increase audio by 1dB: ⌥⌘=

This keybinding is functional on the Macs here.

Which macOS keyboard layout is enabled?

Dear Reynaud, thank you so much for the quick reply.

The default keybinding for Playback is Space.

⌥/ is the default keybinding for Play In to Out, which requires a Range.

The Playback with Space works, but I still cannot use ⌥/. I selected a range above a short clip using X. I can get it to play In to Out using that option in the Playback Menu, but the shortcut does not work.

- Increase audio by 1dB: ⌥⌘=

This keybinding is functional on the Macs here.

I tried it again on the music track but it does not work. I can decrease it though, using ⌥⌘-.

Which macOS keyboard layout is enabled?

I have the default keyboard layout enabled. I should say that I have an Italian keyboard. Maybe that is the issue?

Thank you for the help!

Update - I changed the keyboard to the US layout and now it works!

Am unable to make 'option command L' function - it is the standard keyboard stroke to lock/unlock the 'linked selection' tool on the edit page, an essential one for working fast.
I am using the DaVinci keyboard layout setting in Resolve Studio with my keyboard set to US English on my MBP, running latest Sonoma on maxed out M1Max MBP running latest Resolve Studio 18.6. Any ideas to fix this anyone?

Am unable to make 'option command L' function - it is the standard keyboard stroke to lock/unlock the 'linked selection' tool on the edit page

Are you using the US keyboard layout?

Yes, I have Mac OS Sonoma set to use US keyboard layout and it is a US version of MBP - I do have two other languages as pull down options but rarely use them and they are not the active keyboard version when I am having this issue.

In exasperation, I now tried to change shortcut to apple, option and Z, which appeared to be an open/available sequence but that also does not work. So I switched it back to apple, option, L and of course still not working. Weird. Ideas, anyone?

Very weird. In OS settings Accessibility/keyboard, I turned on, then turned back off again the switch for "full keyboard access" and now the Shift-Command-L sequence works to turn 'linked selection' on and off. There are other shortcut keys that still do not work in Resolve, however, e.g., F9 and the other function keys do not do what they are touted to do according to the default DaVinci Resolve keyboard setting. Hassling onward with this. Wish BMD would make devote some attention to making this all work better.