Basically the homepage is for experts, and this little url is for experts to get their clients.
Back to your question:
Yes, tutoring is an important part of our service, if you type "english tutor" into that search box, you will pretty much get the idea.
At this moment, english tutor is our main focus and almost every visitor come to the site is to find tutor or is a tutor. So the search form is quite useful to them.
But we don't want to offer categorization or tagging now is because that there is not so much to be categorized or tagged. I personally don't like a 3 level of categories without any real content. And we don't want to tag our site to be a tutoring platform with those categories. So we tend not to show them at the moment.
Apart from that, everything you said is true. With the exception of we are not an online tutoring intermediary.
If you are interested, we are also on our way making Airbnb for individual's expertise.
http://expert.io
But it is just like the Airbnb story, start from nothing is always difficult.
is there anyway to convert a address to its timezone?
say Lyon in France, there is only one timezone in France which is Europe/Paris, but how to convert a city like Lyon or even a small town into its timezone?
cause there might be multiple timezones in a country...