Why is there no redirect during authorization?

Question

Node.js

The code seems to be working, but there is no redirect to the main one, although it is clear that serializeUser works:
PASSPORT.JS

passport.serializeUser((user, done) => {
  console.log("USER:", user);
  done(null, user.id);
});

passport.deserializeUser((id, done) => {
  console.log(id);
  User.findOne({
    where: {id: id}
  })
  .then(({dataValues: user}) => {
    done(null, user);
  })
  .catch(err => {
    done(err, null);
  });
});

passport.use(new LocalStrategy((username, password, done) => {
  console.log(username)
  User.findOne({
    where: {username: username}
  })
  .then(({dataValues: user}) => {
    if (!user) {
      return done(null, false, { message: 'Incorrect username.' });
    }

    User.validPassword(password, user.password)
      .then(isMatch => {
        if (isMatch) {
          return done(null, user);
        } else {
          return done(null, false, { message: 'Incorrect password.' });
        }
      })
  })
  .catch(done);
}));

module.exports = passport;

ROUTING

app.get('/login', (req, res) => {
  res.set('Content-Type', 'text/html');
  res.render('create_user.pug');
});

app.post('/login', (req, res, next) => {
  passport.authenticate('local', function(err, user, info) {
    if (err) { return next(err); }

    if (!user) {
      console.log("REDIRECT", 'login')
      return res.redirect('/login');
    }

    req.logIn(user, function(err) {
      if (err) { return next(err); }

      console.log("REDIRECT", user)
      return res.redirect('/');
    });
  })(req, res, next);
});

// all
app.get('/*', (req, res, next) => {
  if (!req.isAuthenticated()) {
    res.redirect('/login');
  } else {
    next();
  }
});

require('./routes/index')(app);

Answer 1

Come on, first explain how you understand what the res.redirect method does?