Esxi running macos For selur

[Selur]

also for binaries you need in addition to apply sudo chmod +x to make it active (or how did you name that)

No you do not. That was only needed since I miswrote that 655 instead of 755 should be used.
-> read the explanation on what the numbers/rights stand for

What to type in terminal sudo chmod 0644 or sudo chmod 644 ?
0 at start is for single files and not for folder-like items?

probably doesn't matter
iirc using 4 numbers is the correct way, but normally if there are only 3 numbers the first is set by the file type

Cu Selur