expert building

anyone know about a guide about expert building, how someone should do about it, when level come to it, ty ???

Could you please be more specific on what you would like to know? From my search I can't seem to find a guide on expert building But I believe its pretty self explained. As well under the buildings in the expert tab you wish to build it will tell the level required to build that building.

Hope this helps.

There is no right or wrong way to building your settlement.
Just do what feels right to you.