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update 2 – this is basically pointless with contemporary hardware and software. Just use the defaults for something like cgdisk or GParted:

https://gparted.org/display-doc.php?name=help-manual#gparted-specify-partition-alignment

Use MiB alignment for modern operating systems.
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The Cylinder/Head/Sector values reported by modern disk devices no longer have a direct physical relationship to the data stored on the disk device. Hence it is no longer valid to use this alignment setting to achieve enhanced performance.

update: cgdisk, when beginning with a new partition table, when creating the first partition, automatically creates a small empty partition before it, and thus is said to align everything properly. I haven’t double-checked this.

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