What is the best way to make nice presented section in revit ?

you have to use join geometry for any unconnected elements & also you can use mask region for hide any unneeded parts

sir can you be more specific.??

i mean sections in sense...Which lod(level of detailing ) your using..

what do you want to indicate..??

I mean when you create a building on revit by making walls and floors you always get a bad section specially the connection between the slab and the walls ..

so what i want to indicate is a detailed proper architectural section