Backend Development is also known as server-side development. It is everything that the users don't see and contains behind-the-scenes activities that occur when performing any action on a website. It focuses primarily on databases, backend logic, APIs, and Servers.
There's a lot to tell about backend webdesign. How to learn it, where to find usefull tools, etc., etc.
On this page you can get some information about Back End Webdesign
The W3Schools website is a good place to learn PHP, Python and SQL and several other languages for front end development.
Website: W3Schools.com PHP
Website: W3Schools.com Python
Website: W3Schools.com SQL
PHP is a popular general-purpose scripting language that is especially suited to web development. Fast, flexible and pragmatic, PHP powers everything from your blog to the most popular websites in the world.
Website: php.net
XAMPP is the most popular PHP development environment XAMPP is a completely free, easy to install Apache distribution containing MariaDB, PHP, and Perl. The XAMPP open source package has been set up to be incredibly easy to install and to use.
If you want to develop on you own computer or laptop I advice you to use Xampp. It's completely free and easy to install
Website: XAMPP website
FileZilla is a free FTP solution. Easy to use and for me a nice tool to move files from my local pc or laptop to my hosting provider.
Website: FileZilla website
Symfony is a set of reusable PHP components...
... and a PHP framework for web projects
Website: Symfony website
Laravel is a web application framework with expressive, elegant syntax. A web framework provides a structure and starting point for creating your application, allowing you to focus on creating something amazing while we sweat the details.
Website: Lavarel website
Python is powerful... and fast; plays well with others; runs everywhere; is friendly & easy to learn;is Open.
For backend development I looked at two frameworks Django and Flask
Website: python.org
Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. Built by experienced developers, it takes care of much of the hassle of web development, so you can focus on writing your app without needing to reinvent the wheel. It’s free and open source.
Website: Django website
Flask is a micro web framework written in Python. It is classified as a microframework because it does not require particular tools or libraries.
Website: Flask website