Answers for "need to ng serve --host 0.0.0.0 --port 5000 at first time why ?"

make angular to run on a different port

"projects": {
    "my-cool-project": {
        ... rest of project config omitted
        "architect": {
            "serve": {
                "options": {
                    "port": 1337
                }
            }
        }
    }
}