Text does not start on the same line.

main.dart

import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}
class User{
  List<String> numbers;
}
class MyApp extends StatefulWidget {

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  User user = User();
  
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Column(children:[
          Text('hello world...kfjfjfjfjfjfjfjfjfjfjfjfjfjfjfjfjf'),
          Text('hello world..'),
        ]),
      ),
    );
  }
}

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}
class User{
  List<String> numbers;
}
class MyApp extends StatefulWidget {

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  User user = User();
  	
  List<TextSpan> textSpans = <TextSpan>[
    TextSpan(text: 'Woolha \n', style: TextStyle(color: Colors.blue)),
    TextSpan(text: 'dot hello world long line with more context should start new line sir \n'),
    TextSpan(text: 'com \n'),
    TextSpan(text: 'word \n'),
    TextSpan(text: 'word \n'),
    TextSpan(text: 'word \n'),
    TextSpan(text: 'word \n'),
    TextSpan(text: 'word \n'),
    TextSpan(text: 'word \n'),
    TextSpan(text: 'word \n'),
  ];
  
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: RichText(
    text: TextSpan(
        style: TextStyle(color: Colors.black, fontSize: 18),
        children: textSpans,
    ),
  ),
      ),
    );
  }
}

This is how I solved it.

DART PAD