This is the simple and straight forward approach, but it does present a downside. If you feel that in the future you will want to make changes to the photos on a page (add to, delete from or re-edit photos), I recommend that you use option 2 in place of this option.
Create Folders on your computer desktop
In the example here, we have two top level folders... "Faces" & "Landscapes".
The "Faces" folder will contain the photos we wish to display & no sub-folders. The "Landscapes" folder has two sub-folders... "Grand Teton" & "Yellowstone" which will contain the photos we wish to display.
Export photos into these folders
From Lightroom Classic, export the photos you wish to include into folders on your computer desktop. I would suggest that you setup an export preset in Lightroom Classic for 2,000 pixels on the longest edge.
Using our example, the "Faces" folder will contain the photos we wish to display & no sub-folders. The "Landscapes" folder has two sub-folders... "Grand Teton" & "Yellowstone" which contain the photos we wish to display.
Thus, we will have three photo Pages on the web site. Click on each of these on the left-hand menu here to see where we are going.