HubSpot

Classic CMS themes (HubL) and the newer CMS React (React + HubL) projects.

HubSpot CLIauth, upload, watch, project commandsHubL essentialsmodules, requires, fields, escapesCMS Reactcreate-cms-theme, local server, hs project upload

Which path?

Project type	Start here
Classic theme / modules	CLI + HubL
New React + HubL theme	CMS React

Sandbox

Use a CMS developer sandbox for experiments — never practice deploys on a client production portal first.