tiles distance

I’m relatively new to the game I build in random places never really plan anything or know that districts you build can give points to a certain tile is there a way to better understand these things? I am going relatively great and leading on prince difficulty, any suggestions would help

As radius/range of workable tiles always seem ridiculosuly small I wonder how to change it. I even menage to find some mod, but what I want most is to understand this better. I mean i saw 3 different atributes in GlobalDefines: <Row Name="MAXIMUM_BUY_PLOT_DISTANCE"> <Row...