Protect your youtube channel . with this simple steps , Login to your google account. and visit my accounts page after that choose security option. Check image below
Observe carefully . Now in above image contains two options (Off ), You must have to turn on that two settings.
Use your phone to sign in means every login you will receive otp for your mobile number,
If you enable that you are securing your account 90% . Don’t share your mobile with any other persons . Losses cause more Losses.