Every application nowadays must have an authenticated system. In that we will have some login, registration, forgot password, reset password, change password and other packed modules available. We are using CodeIgniter 4 in this article. So accordingly we are going to create Codeigniter 4 Login and Registration. Easy & simple step by step guide to implement in CodeIgniter 4. The modules we are going to cover to develop this system as – Filters, Controller, Routes, Database, Model, View, Custom Rule.