Cannot merge back space left by bootcamp So, I uninstall Windows 10 using Bootcamp, but now I got this 'free storage' space that I cannot merge back again, I've tried everything that's already answered in this forum for this type of questions, since booting in recovery mode to running the sudo diskutil apfs resizeContainer /dev/disk0s2 0 command on the terminal

If I tried to do it in diskutility I got the following error


And if I try to run the command to resize my partition I got the following error:


Here's an extra pic of my diskutil list command:


And my diskutil


Any suggestion ? I'm running High Sierra Version 10.13.6
You want to grow the APFS container, not the physical drive that it's on (as this would be impossible, obviously). This can't be disk0, and it looks like it's disk1 in your screenshots, so diskutil ap resizeContainer disk0s1 0 should do what you want. 

There is no disk0s2 to operate on, so that should error based on your excellent details in the question.

It’s safe to do a live resize of the container.