For PHP and html beginners, how do I deal with an automatic leave System website?

For PHP and html beginners, if you want to create an automatic leave system for your website, please master the guide & nbsp; if an employee asks for leave, fill in the time for the website, ask the reason, and then submit & nbsp; then I want to automatically send an email to the corresponding team lead, wait for approval, don't know how to implement it, give some suggestions and ideas, and finally give some code to me to learn html and php. this is relatively simple, just give your ideas 1. "if an employee asks for leave to learn PHP and html on the Internet, he must create a website for the automatic leave system.
Master Guide
If an employee asks for leave, fill in the time on the website, ask the reason, and then submit it.
Then I want to automatically send an email to the corresponding team lead and wait for approval. I don't know how to implement it. I want to give some suggestions and ideas,
Finally, I learned html and php only a little bit.

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This is relatively simple. just give your thoughts.

1. "If an employee asks for leave, fill in the time on the website, ask for the reason, and submit it." This form is directly submitted to the database for storage.

2. we recommend that you use "phpmailer" for the email. for details about how to configure the parameters, see the online tutorial.
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Form, submit form, get form data, send email