Exemption to $500 rule for handymen?

Hi, could you clarify the role of a handyman and the handyman exception to the $500 rule? Is it true there’s a grey area where a sole-proprietor handyman who doesn’t work at construction/re-model/new home sites may charge more than $500 for installation of finished products that do not become a fixed part of a structure? What are some examples of these types of projects? Thank you in advance!