GUIDES
Naming a second connection is the easy part — it only actually gets used once a model or raw query explicitly references it by name, since Laravel otherwise always defaults to the one named in DB_CONNECTION.
A plain PHP class for app-specific logic that doesn't belong in a model or controller — with a class alias so it's callable without a full namespace, and when a facade is worth the extra step instead.
Blade automatically injects a $loop variable inside every @foreach with index, first/last flags, and iteration count built in — no manual counter variable needed.
ngClass toggles CSS classes based on component state; ngStyle sets individual inline style properties directly. Most components only ever need the former.
The dot-notation syntax for validating each item in an array field, and the * wildcard for a variable-length list — like a form that lets someone add multiple items dynamically.
public, protected, and private control which code is allowed to touch a class's properties and methods — the same three-level model works nearly identically across PHP, Java, and most other OOP languages.
Building auth manually rather than scaffolding it gives full control over the form and flow — the AJAX version follows the same controller logic, returning JSON instead of a redirect.
count() returns just a number, while groupBy()+get() returns full grouped result sets — the two approaches solve genuinely different problems and shouldn't be reached for interchangeably.
response(), the Response facade, and the difference between returning a string, a view, JSON, or a full Response object from a controller.
The basic unique rule works fine for creating a new record — updating an existing one, or accounting for soft-deleted rows, both need the fluent Rule::unique() builder instead.
serialize() automatically collects every named field in a form into a query-string-formatted value — the single detail that turns converting a normal form into an AJAX submission into a two-line change.
The mimes, max, and dimensions validation rules for file uploads, and why validating the file extension alone is not a real security check.
