First you should install Node(v14.15.0) and PostgreSQL. After all installation completed;
$ yarn install
# development(vscode)
$ on default press f5
# development
$ yarn run start
# development watch mode
$ yarn run start:dev
# production mode
$ yarn run start:prod
# unit tests
$ yarn run test
# e2e tests
$ yarn run test:e2e
# test coverage
$ yarn run test:cov
# Adding a new migration after schema change
$ yarn run migration:generate <YourMigrationName>
# Running migration
$ yarn run migration
# Revert last migration
$ yarn run migration:revert