Rendered fields manually from modelform..How can i save it?

Question

I am beginner in django. I Rendered fields manually from modelform by using {{form.field_name}}.There are 5 fields in my model . how can i save field data by using class based view.

When Rendered fields by using {% form %} then i can save my form by using CreateView.like this

class StudentCreate(CreateView):
    model = StudentDetails
    fields = '__all__'
    success_url = reverse_lazy('list-student') 

but when i Rendered fields manually from modelform by using {{form.field_name}}.. i can't save it by using Createview.. Any idea about it? Why is this not working ? How can i save it?

Forms.py

class Student(forms.ModelForm): 
class Meta:
    model = StudentDetails
    fields = "__all__"

Template code

{{form.name.label_tag}} {{form.name}}