As ofnuts said his ofn-tiles plugin is very direct, it is a bit picky about image sizes, which have to be multiples of the tile size. Give it a try, you will not learn without trying.
Worth trying the gmic plugin as well.
I am very hands on. This using a grid of guides and the script / plugins mentioned earlier.
https://youtu.be/A3o2OR23Hnw about 8 minutes duration.
It does show where to put the script and plugins. Best place is your User profile, for Windows usually:
C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\plug-ins
C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\scripts
Why are your plugins not showing ? You can put in individual folder where the folder name is the same as the plugin minus the extension, so ofn-export-layers.py goes in a folder ofn-export-layers. Hardly worth the effort for a single file. (however it will be required when Gimp 3.0 comes along)
A bit in there about determining the tile size and general hints.
Worth trying the gmic plugin as well.
I am very hands on. This using a grid of guides and the script / plugins mentioned earlier.
https://youtu.be/A3o2OR23Hnw about 8 minutes duration.
It does show where to put the script and plugins. Best place is your User profile, for Windows usually:
C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\plug-ins
C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\scripts
Why are your plugins not showing ? You can put in individual folder where the folder name is the same as the plugin minus the extension, so ofn-export-layers.py goes in a folder ofn-export-layers. Hardly worth the effort for a single file. (however it will be required when Gimp 3.0 comes along)
A bit in there about determining the tile size and general hints.