Globals
Share site-wide CSS, JavaScript and simple values across Resources.
Globals are shared values, styles or small enhancements used by other site Resources.
Shared styles and behaviour
Use a Global when several Resources need the same site-specific styling or behaviour. Keep it focused so changes do not unexpectedly affect unrelated areas.
Shared values
Globals can also provide values that need to be reused in several places. Do not place passwords, private keys or other credentials in a public Global.
When to avoid a Global
If something is used in only one Component, Header or Template, keep the change with that Resource instead of making it site-wide.