1.put all these files and folders in a folder called task-manager(create one)

2.[[[[now open cmd in the task manager folder or set the path in cmd to the folder.

Hold Shift and right click on task-manager folder select open terminal or Open Command Window]]]]

3. once opened run these commands in cmd
npm init -y
npm install express mongoose jsonwebtoken bcryptjs cors
npm install dotenv

4. run this finally
  node server.js

if it doesnt work pray to god and leave the internal🙂