Help:Substitution/tl;dr

This page should summarize the procedures of substitution for advanced editors, that keep forgetting, which syntax does what:

I want to...

 * ...insert template's inside
 * Use


 * ...insert templates's inside and subtemplates' insides too
 * Use  or   in the template
 * will show up on the template page, whereas  not


 * ...delay a substitution one edit later
 * Use


 * ...have a control over a substitution of subtemplates
 * Use, deeper substitutions like:
 * (no substitution)
 * (one-level substitution)
 * or  (two-level substitution)
 * or  (three-level substitution)


 * ...make a preload page with includeonly/noinclude tags
 * Use  or


 * ...show template code instead of the template
 * Use