[Python] Is it necessary to use WTForms in a Flask project? [closed]

Well, I'm learning Flask on my own, it seems harder than PHP. I'm having trouble finding good YouTube tutorials, and there are a lot of things to learn, and there are a lot of them, and I've seen some people in these YouTube tutorials create form fields without an HTML tag, but with a wtforms module or create a class for several fields, etc. It's so important to learn how to create form fields in Flask?

from flask import Flask,render_template,redirect,url_for,request,session,flash
from flask_sqlalchemy import SQLAlchemy
from flask_wtf import CSRFProtect,FlaskForm
from datetime import timedelta
app=Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"]="sqlite:///db_user.db"
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"]=False
db=SQLAlchemy(app)
app.secret_key="hello world"
app.permanent_session_lifetime=timedelta(days=400)
csrf=CSRFProtect(app)
class User(db.Model):
id=db.Column(db.Integer,primary_key=True,autoincrement='auto')
nom=db.Column(db.String(30),nullable=False)
mdp=db.Column(db.String(30),nullable=False)
def __init__(self,nom,mdp):
self.nom=nom
self.mdp=mdp
def __repr__(self):
return "{id: "+str(self.id)+", nom: "+self.nom+", mot de passe: "+self.mdp+"}"

@app.route('/')
def home():
return render_template('index.html')

@app.route('/sign_in',methods=['POST','GET'])
def signin():
if request.method == "POST":
session.permanent=True
session["nom"]=request.form["nom"]
session["mdp"]=request.form["mdp"]
u=User(session["nom"],session["mdp"])
db.session.add(u)
db.session.commit()
flash("vous étes maintenant inscrit a votre compte")
return redirect(url_for('traitement'))
else:
if "nom" in session:
flash("vous étes deja inscrit a votre compte")
return redirect(url_for('traitement'))
return render_template('form.html')
@app.route('/traitement')
def traitement():
if "nom" in session:
nom=session["nom"]
mdp=session["mdp"]
return render_template('traitement.html', nom=nom,mdp=mdp)
else:
flash("vous n'etes pas connécté pour utiliser la page d'acceuil")
return redirect(url_for('sign_in'))

@app.route('/sign_out')
def signout():
session.pop("nom",None)
session.pop("mdp",None)
session.clear()
flash("vous vous etes déconnéter du site")
return redirect(url_for('signin'))

if __name__=="__main__":
with app.app_context()
db.create_all()
app.run(debug=True)

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