got to the main folder of the project where it contains client and server

Install dependencies

cd server
npm install
cd ..
cd client
npm install
cd ..

make .env file in /server folder and these values

PORT=8000
MONGO_URL="Your_mongo_url/mern" # make database called mern and collections of posts, users, tickets in mongodb ex mongodb:localhost:201322/mern
JWT_SECRET="your_jwt_secret" # you can generate this in base 64 or just add random values

Running the website with the server

When all it's setted up enter this:

cd client
npm run dev
cd ..
cd server
npx nodemon index.js

Final step is just checkout around the website Enjoy!