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jinja2 template expressions

Hy, i am very new to web dev and jinja2. i encountered a problem with jinja, when i render template and want to output user name to web page who loged in...well i cant get one. Here is my index.html file with jinja expression in tag:
{% extends "base.html" %}
{% block content %}
{% if user %}
<h1>Welcome to Flask authentication site, {{ user.name }}!</h1>
{% else %}
<h2>Hello, log in or sign up</h2>
{% endif %}
{% endblock content %}

Problem: jinja2.exceptions.TemplateSyntaxError: Encountered unknown tag 'endwith'

#app.route("/user")
def user():
if "user" in session:
user = session["user"]
return render_template("user.html", user=user)
else:
flash("You are not logged in")
return redirect(url_for("login")
This is the python code and below is the html
{% extends "base.html" %}
{% block title %} User {% endblock %}
{% block content %}
{% with messages = get_flashed_messages() %}
{% if messages %}
{% for msg in messages %}
<p>{{msg}}</p>
{% endfor %}
{% endif %}
{% endwith %}
<p>Welcome, {{user}} </p>
{% endblock %}
Problem: jinja2.exceptions.TemplateSyntaxError: Encountered unknown tag 'endwith' ...and i cannot figure out what is the problem. Im pretty sure its something obvious.
Debugger shows me two problems: first in python codefile and the second in the user.html file.
And here is the traceback:
enter image description here

How to add images in email with django allauth

I have troubles with django allauth
Here's my template
password_reset_key_message.txt
{% autoescape off %}
{% load static from staticfiles %}
{% load i18n %}Hello{% if username %}, {{ username }}{% endif %}!
{% if username %}{% blocktrans %}In case you forgot, your username is {{ username }}.{% endblocktrans %}{% endif %}
You're receiving this e-mail because you or someone else has requested a password for your user account.
It can be safely ignored if you did not request a password reset. Click the link below to reset your password.
{% load static %}
<img src="{% static "avatar.jpg" %}" alt="avatar" />
{{ password_reset_url }}
{% if username %}{% blocktrans %}In case you forgot, your username is {{ username }}.{% endblocktrans %}
{% endif %}{% blocktrans with site_name=current_site.name site_domain=current_site.domain %}Thank you for using {{ site_name }}!
{{ site_domain }}{% endblocktrans %}
{% endautoescape %}
I'm trying to add image in email body (already trying with link on source and converting image to base64) but got same result
But when I click on reset_email I got this result:

Invalid block tag: 'shift_info', expected 'empty' ili 'endfor' Django

So, I've visited a lot of questions here on SO regarding Django block tags, but I was unable to learn from them in my perticular problem.
week_table.html
{% load base_extras %}
...
{% for shift in shifts %}
{% if shift.user %}
{% if user in shift.user.all or shift.user.count < shift.usernum %}
<td class="clickable" href="{% url 'termini:shift_add_remove' shift.id %}">{% if shift.name %}{{ shift.name }}<br>{% endif %}{% for usr in shift.user.all %}{% shift_info usr %}{% endfor %}</td>
{% else %}
<td>{% if shift.name %}{{ shift.name }}<br>{% endif %}{% for usr in shift.user.all %}{% shift_info usr %}{% endfor %}</td>
{% endif %}
{% else %}
<td class="clickable" href="{% url 'termini:shift_add_remove' shift.id %}">{{ shift.name|default:"" }}</td>
{% endif %}
{% endfor %}
The problem is I get Invalid block tag: 'shift_info', expected 'empty' ili 'endfor' error
shift_info is defined in base_extras.py
base_extras.py
from django import template
import re
register = template.Library()
#register.simple_tag
def user_info(user):
name = '%s %s' % (user.first_name, user.last_name)
if not name.strip():
name = user.username
return name

It's a simple case of typos and not looking at your own code...

How can i override django contrib comments template?

The django contrib comments form i'm using:
{% get_comment_form for post as form %}
<form action="{% comment_form_target %}" method="post">{% csrf_token %}
{% if next %}
<div><input type="hidden" name="next" value="{{ next }}" /></div>
{% endif %}
{% for field in form %}
{% if field.is_hidden %}
<div>{{ field }}</div>
{% else %}
{% if field.name == 'comment' %}
{% if field.errors %}{{ field.errors }}{% endif %}
<p
{% if field.errors %} class="error"{% endif %}
{% ifequal field.name "honeypot" %} style="display:none;"{% endifequal %}>
{{ field.label_tag }} {{ field }}
</p>
{% endif %}
{% endif %}
{% endfor %}
<p class="submit">
<input type="submit" name="post" class="submit-post" value="{% trans "Post" %}" />
</p>
</form>
After submitting the form, it redirects to http://127.0.0.1:8000/comments/posted/?c=..
That means it calls the template django/contrib/comments/templates/comments/posted.html
The content of django/contrib/comments/templates/comments/posted.html:
{% extends "comments/base.html" %}
{% load i18n %}
{% block title %}{% trans "Thanks for commenting" %}.{% endblock %}
{% block content %}
<h1>{% trans "Thank you for your comment" %}.</h1>
{% endblock %}
That doesn't extends my project's base.html.
I need to customize/override that template so that it extends my project's base.html. How can i do that?
If i can't do that, then if i upload my django web project on server, then how would i edit the content of django/contrib/comments/templates/comments/posted.html so that it looks like that:
{% extends "path/to/myproject/templates/base.html" %}
{% load i18n %}
{% block title %}{% trans "Thanks for commenting" %}.{% endblock %}
{% block content %}
<h1>{% trans "Thank you for your comment" %}.</h1>
{% endblock %}
On local pc, for this time i changed/edited the content of django/contrib/comments/templates/comments/posted.html hard-coded to extends my project base.html.
Can anyone give some idea to solve this? I have searched a lot to solve this.

Just override it in your project's "templates" directory:
<project_root>/templates/comments/posted.html
It doesn't seem to be well documented in either the comments app or Django's general template documentation, but it works the same as overriding admin templates (which is documented).