First fix
First fix is normally considered to be after the shell of the building has been completed. Following this it involves Joinery and building work to roof, internal walls, floors and ceiling inserting all cables for electrical supply along with pipework for water supply before plastering. 
Method of Removing mill scale and old paint coatings from steelwork.Fresco
Applying lime based paint onto wet lime plaster.
Decorating skill needed to produce a good finish.
Frog
An indentation within a brick which reduces weight.
The frog face of the brick is normally laid face up for maximum strength.
Galvanised Steel
Galvanised steel is where steelwork is dipped coated with zinc.
See: Galvanised process: https://www.galvanizing.org.uk/galvanizing-process/