Word for something required by most but not all

Need a word that can describe a situation where the majority of the population is required to do something. Because not the entire population is required, required itself, mandatory, and similar such words are not entirely appropriate. This word needs to convey the same sense of authoritativeness that required does.

Ex. will need a heading to describe a section of trainings that must be completed by most of our employees.

You're supposed to supply a sample sentence. But here goes:

standard: usual or expected; not involving something special or extra: a standard contract (Cambridge)

Example:

If you've already completed the standard safety training, I can go ahead and etc.

default: A default situation is what exists or happens unless someone or something changes it. He appeared unimpressed; but then, unimpressed was his default state. (Collins)

If you've already completed the default safety training, I can go ahead and etc.