Magnolia 5.4 reached end of life on November 15, 2018. This branch is no longer supported, see End-of-life policy.
The most modern and future-proof way to reuse content is a Magnolia app:
The content reuse tutorials in Magnolia 5.3 documentation use the Standard Templating Kit (STK), a predecessor of Magnolia Templating Essentials (MTE). Follow the principles and adapt the examples to Magnolia 5.4 and MTE yourself or watch DOCU-567 - Getting issue details... STATUS .