Failed to load resource: the server responded with a status of 404 (not found)

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Python2.7

I am a beginner in using python and am working on a project. I used this command "python manage.py runserver" several times and worked well until I encountered these following errors when I used "inspect" in my web browser.
1.Failed to load resource: the server responded with a status of 404 (Not Found)
popper.min.js:1
2.Failed to load resource: the server responded with a status of 404 (Not Found)
bootstrap.min.js:1
3.Failed to load resource: the server responded with a status of 404 (Not Found)
(index):336
4. Uncaught ReferenceError: $ is not defined at (index):336
5.logo.jpg:1 Failed to load resource: the server responded with a status of 404 (Not Found)The page could not display the css, but displayed plain text.

What I have tried:

I checked the path and is correct :






{% block css %}

{% endblock css %}