When do I have to call save() on a Model Instance?

I want to reduce the database queries, imagine I have a case like this:

def function1():
    user = User.objects.get(id=1)
    user.name ="Myself"
    function2()
    function3(user)
    user.save()
   
def function2():
    user = User.objects.get(id=1)
    user.lastname = "private"
   
def function3(user):
    user.age = 18

Even if this works (haven't tested it yet and I can imagine that at least function2() might be a problem), should I immeditately call .save() in each of those functions?

Or is it possible to freely modify the model and save it at a later stage? If so, function2() would not see the new value of user.name of course, however function3 should be able to see it (but probably not user.lastname).

Is there a best practice?

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