Kenny Chen wrote:
But if "Virtually Unlimited Positions Per row" available in position setting, there should be a Gantry 5 particle allow "virtually unlimited columns per module". Besides I am curious if there is any limitation for the types of particle to embed in a position ? A rich collection of particle like app might encourage subscriber to renew.
No, there is a Gantry 5 particle called "module position" which you drag onto a layout and then call that position what ever you wish. You can drag as many of these onto the layout as you wish (that's why we day virtually limitless). Also, in Gantry 5 you can add additional rows within a section too. No, there is no limitation what type of joomla module can be assigned to a position. Gantry 5 particles don't have to be assigned to a position at all they are dragged directly on to the layout.
Each template comes with many different particles and the documentation for each template explains what the template includes.
I encourage you to read the Gantry 5 documentation to understand the new concepts that Gantry 5 introduces