Do I need to list everyone travelling on the UK online visa application? [closed]

I am filling out a UK visa application form to attend a graduation ceremony. I am travelling with 4 friends who are also applying for visas. Do I need to give everyone's information in the "Are you travelling with anyone?" section?

Also, we have booked an apartment which can accommodate up to 6 guests; the booking is in my name. Can my friends submit the same booking confirmation with their applications? Their names do appear on the booking paper as guests.