So...are there any recommended trainings to teach off road driving? Like the
http://www.i4wdta.org/ or something?
They do offer classes and many of the instructors offer videos. The classes are expensive though.
My best recommendation if you are new to the off-roading world or are just looking to grow your skills or are looking for trail buddies and drive a Toyota (even if you don't) get on the old interwebs and find a TLCA (Toyota Landcruiser Association) chapter and reach out to them. The TLCA is all about supporting off-road exploration in a safe, family friendly atmosphere. Although TLCA is a Toyota based organization, most chapters allow outside guests to attend their trail runs. The people involved in these runs have all kinds of trail experience and you can learn a lot. I am sure that there are other manufacturer specific organizations out there as well that are very similar depending on what you drive. Although (being a Toyota owner) I have met many lifelong friends from around the country and gained a ton of knowledge by attending TLCA events.
There are many different events that you can attend spread throughout the country that stand out. Obviously TLCA sponsored events, as well as any Jeepers Jamboree, and what has grown into one of the biggest of them all is the Overland Expo. The expo offers an event on the East and West coast every year and offers up training classes throughout the event, and as a bonus you get to see some really cool rigs while you are there.
Sorry if my past posts on this topic seemed like I pointed fingers and called out the driver of the 4Runner for not knowing what he or she was doing. Stuff can go wrong on the trail to even the most experienced driver. What we do is a great way to recreate. I just want people to realise that this type of thing can happen and encourage people to be as safe as possible while out having fun and seeing cool stuff.