Backend:

Configure everything necessary in the .env file, using .env.example as a reference. For SMTP_USER, create a dummy email and enable two-factor authentication

Then:

After that:

cd server/
npm i
npm run db:update
npm run dev

Frontend:

Similarly, configure your .env file based on .env.example with the address of your backend, something like http://localhost:8000. Then:

cd client/
npm i
npm run dev