How to code the backend for the following code of the website in PHP so that an admin can make announcements, upload pictures and make Posts?

Program: Workshop Entry

Program Code:

Time: Venue:

Program: Semanir Entry

Program Code:

Time: Venue:

Program: Exhibition Entry

Program Code:

Time: Venue:

Program: Conference Entry

Program Code:

Time: Venue:

Guest Series Entry

Series Code:

Time: Venue:

Pitching Entry

Pitching Code:

Time: Venue:

       </form>
</fieldset>