Which are the best online coding tutorials through which I can introduce my child to coding. Is 6-year too young to introduce her to coding?

Code.org is probably a good site to get started on. If you're interested in getting your child started on digital literacy, Google x Saturday Kids x 21C Girls is running a free full day coding camp at Google's offices this Saturday (boys can join too!). https://www.eventbrite.sg/e/google-x-saturday-kids-x-21c-coding-camp-aug-27-2016-tickets-27256620285