Build a website using java, spring boot and mongodb

I want to have a website which includes the following items:
1) User can create an account
2) User can login to his account
3) User can ask questions (something similar to Stackoverflow.com)
3-a) User must define at least 2 tags for his/her question, click on confirm, see the preview version of the question, confirm it and then it should be submitted.
4) User can answer the questions (same as 3-a, the user should see the preview verison first)..
5) User can enter the link to a Youtube video and the video can be shown in the same window (and the user should NOT be forwarded to the Youtube Website.).
6) User can have a profile section and see a) question s/he has already asked b) answers s/he has given to the questions
7) User can search among his own questions or answers in the profile section.
8) User can search the website for a question and get the results back.
8-a) If the answer is not found, the same text must be searched in Youtube automatically and the result from Youtube must be returned to the user.
9) User can comment on questions.
10) If the user answers a question, s/he will get some points.
11) User can search based on the tags.
12) User can activate notification and get notified when a question with a specific tag is asked.
13) User can forget his/her password and change his/her password.
14) The Website must work properly on all well-known internet browsers: Chrome, Firefox, Safari, Edge, and different monitor sizes.

The above mentioned features are the base features. More details are included and the way the exact implementation is performed must be discussed.

IMPORTANT: I NEED THE SOURCE CODE WITH A COMPLETE GUIDELINE HOW TO RUN IT ON MY OWN SYSTEM.