The project is divided into 3 main folders - db, helpers, and public.

In the db folder, all files related to the connection of the database to the website are stored, including functions for adding, editing, and deleting data.

The helpers folder contains additional functions and constants that help with easier development of the website - constants for the two types of users (client/buyer and broker), sessions, etc.

In the public folder, we can find the main files of the website.

The languages used are PHP, SQL, HTML, and JavaScript. Most of the website's functionalities are written in PHP, SQL is used for queries to the database, HTML is used for the website's structure, and some small functionalities are written in JavaScript.

The system (website) consists of one database named db. It is built from 7 tables:

• users - store users in the system (site);
• real_estate_types - stores property types in the system (site);
• real_estate_types_of_construction - stores property construction types;
• real_estate_level - stores the completion types of properties on the site;
• real_estates - stores information about properties in the system (site);
• real_estate_user - stores information about a property that has been added to favorites by a customer / buyer;
• real_estate_images - stores the photos of a property.

One user (if they have broker rights) can add many new properties. One property is created by one user - User:Property = 1:M

One user, with client rights, can add existing properties to a Favorites list. One property can be present in the Favorites lists of many users - User:Favorite Property = M:M

One property can only be of one type (house, apartment, etc.). One type can refer to several properties - Property Type:Property = 1:M

One property can only have one type of construction (brick, panel, EPS, etc.). One type can refer to several properties - Construction Type of Property:Property = 1:M

One property can only have one completion stage (ACT 16, ACT 14, etc.). One stage can refer to several properties - Completion Stage of Property:Property = 1:M

The details of one property can contain several, one or more photos. One photo belongs to the details of one property - Property:Photo = 1:M

The following programming languages were used for the development of the project:

1. PHP
2. SQL
3. JavaScript

And the following tools:

1. Visual Studio Code
2. XAMPP
3. MySQL