Reboot holding alt (a.k.a. option) to see if you get a list of disks to boot from, if 'Macintosh HD' or a similar (Mac boot disk) appears select that & continue to see if it boots.
For Internet recovery try connecting via ethernet if possible.
Internet Recovery requires a good connection to the internet & sometimes Wi-Fi isn't good enough. Reboot holding cmd+alt+r to start Internet recovery. Keep trying go that error appears, sometimes it can take ages & multiple attempts. Try another network if you have access to another one.
Also try just cmd+R to see if the built in recovery works at all.
If you can't get 'internet' or 'standard' recovery to start another option is to get the OS via another Mac. Download a suitable OS from the store & use that to repair/ examine/ backup after making an installer via
Create a bootable installer for macOS - Apple Supportor Diskmakerx.com
Another option is to use Target disk mode to examine, repair or backup form the unbootale Mac…
Use target disk mode to share files between two Mac computers - Apple Support
It works well if you have suitable cables & a second Mac.
The difficult part may be fixing this issue. It seems like you have a damaged disk, meaning that the OS cannot find any usable file systems to boot from.
The important question is …
Do you have any backups?