Use Mac Disk Utility To Safely Resize System Volume (Startup Volume/ Startup Disk) Partition On Mac OS. Safely Create Delete Merge And Resize Hard/Disk Drive Partition Without Losing Data Using MacOS/Mac OS Disk Utility In Catalina. Check Your Disk For Errors Using First Aid.

Sit back and relax while I show you all the above steps in one single video.

Learn the partition rules and avoid gotchas.

Partition Rules Enlarging a partition requires that the partition coming after it be deleted. Reducing the size of a partition will cause a new partition to be created directly behind the partition you’re reducing. This new partition will be sized to fill the available space. Deleting a partition will cause the freed up space to be added to the partition that precedes it. The last partition cannot be enlarged, though it can be deleted
The first partition cannot be deleted.

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Timestamps 0:00 Mac OS Disk Utility Partition First Aid Demonstration 1:10 Startup Disk Volume Inspection Using Disk Utility
1:45 Startup Disk Volume Resizing Gotcha 2:13 Mac OS Disk Partition Rules 2:55 Mac OS Resize Startup Disk Volume - Create Partition 4:20 Mac OS Disk Structure Explained. Volume and Containers 4:54 Run Disk Utility First Aid To Check Mac OS Catalina Installation 6:40 Partition Inspection In Mac Finder 7:30 Resize Enlarge A Mac Partition 7:53 Deleting A Mac Partition 8:08 Deleting The Last Partition 8:20 Fixing The Resizing Gotcha With Disk Utility ... https://www.youtube.com/watch?v=PwQMgz7Jd8M