Hi! Three things i need help on. . .

1. List of 10 ‘excellent’ sources or website of hotels and hotel information
2. List of most important things a traveller needs to know when checking out or scouting for hotels and hotel deals online
3. List of 5 most travelled city in the world and 5 other hotels in those cities which you cannot really find any information online

I hope everyone can help. I really look forward to your insights and input on this.

Greatly appreciated :)