Inclusion_tag doesn't display data in other models on template

Question

I was follow to a old courses Udemy and I try create a project had 2 app( group & posts) and just found out that you can use:

from django import template

register = template.Library()

To allow link models app to another app. In the old courses it just add in models.py and create tag in post_list.html to show what group you join and all group but don't create templatetags folder and how it work. Even when I check the sample it don't had any thing. So I was search gg try build it by myself, but it doesn't show anything. Can you check it. Thank

App groups models.py:

class Group(models.Model):
    name = models.CharField(max_length=235, unique=True)
    slug = models.SlugField(allow_unicode=True,unique=True)
    descripsion = models.TextField(blank=True,default='')
    descripsion_html = models.TextField(editable=False,default='',blank=True)
    member = models.ManyToManyField(User,through='GroupMember')

    def __str__(self):
        return self.name

    def save(self,*args, **kwargs):
        self.slug =slugify(self.name)
        self.descripsion_html = misaka.html(self.descripsion)
        super().save(*args, **kwargs)

    def get_absolute_url(self):
        return reverse("groups:single", kwargs={"slug": self.slug})
    
class GroupMember(models.Model):
    group = models.ForeignKey(Group,related_name='memberships',on_delete=models.CASCADE)
    user = models.ForeignKey(User, related_name='user_groups',on_delete=models.CASCADE)

    def __str__(self):
        return self.user.username

In templatetags group_tags.py:

from django import template
from ..models import Group,GroupMember

register = template.Library()

@register.inclusion_tag('clonemedia/posts/templates/posts/post_list.html')
def get_other_group():
    group_members = GroupMember.objects.all()
    other_groups = Group.objects.all()
    return {'other_group':other_groups, 'group_member':group_members }

In template post_list.html:

{% load group_tags %}
<h5 class='title'> Your Groups</h5>
        <ul class='list-unstyled'>
            {% for member in group_member %}
        <li class='group li-with-bullet'>
            <a href="{% url 'groups:single' slug=member.group.slug %}">{{ member.group.name }}</a>
        </li>
        {% endfor %}

        <h5 class='title'> All groups</h5>
        <ul class='list-unstyled'>
            {% for other in other_group %}
            <li class="group li-with-bullet"><a href="{% url 'groups:single' slug=other.slug %}">{{ other.name }}</a></li>
        {% endfor %}