Just wait until you need to figure out what you want when you want something other than all or none for those permissions. 4 is read, 2 is write, 1 is execute. Add them up to get what you want for each owner/group/other portion.

I learned this relatively quickly running my own server with the intention of my family also using it. Data on a separate drive, backed up regularly and automatically. System on it’s own drive, dd’d when it’s in it’s final state and backed up before I screw around any deeper than trying out a new container. I can bring my server back up in however long it takes to transfer data.