Why doesn't static work?

Question

Django

I connect to the template like this: {% load staticfiles %}
I use it like this:

<link href="{{ STATIC_URL }}assets/plugins/bootstrap/css/bootstrap.min.css" rel="stylesheet">

In settings.py:

STATIC_URL = '/static/'
STATICFILES_DIRS = (
    os.path.join(BASE_DIR, 'static'),
)

Hierarchy: joxi.ru/8AnE5MGSqdG8b2
As displayed on the site: joxi.ru/12Mz78BT4NbLKA / joxi.ru/v293dE4sGMlLWr