Language
Twig
A compiled, auto-escaped template language: inheritance, blocks, and a hard line with PHP.
Twig compiles to PHP. Auto-escaping is the particularity that stops XSS when developers stop concatenating HTML. Template inheritance (layouts, blocks, embeds) keeps presentation DRY without a SPA.
It is not a place for business rules. Filters and functions are for formatting. If the template starts querying, the boundary has already leaked.
Symfony, Ibexa and Sylius all render through Twig. Learning it once pays on every stack.
