Babaev's video series is fine.
Not too complicated (give basic ideas and no more but enough) and educational.
But don't expect a clear route playing King's indian : king's indian is very difficult to handle.
I don't say it to discourage u but this opening (that I play since my childhood), is a jungle : many variations, many structures, many adjustements, many manoeuvres...
I would never advice someone with your rating playing it but if u are motivated, give it a try!
Merci Poucin !
Tonight at my club I prepared the Budapest Gambit (and some variations on it) with the video's of Simon Williams, knowing that my opponent would open with 1. d4. I was suprised at move 3. e3 ..... promised myself to have a better answer for this.
I will check out the Babaev's video series, thx for that tip !
Bon nuit !
But don't expect a clear route playing King's indian : king's indian is very difficult to handle.
Blessed are simple-minded in chess, a clear King's Indian road is clear to them 
: Normal variation --> Standard development --> Orthodox variation. 
Hi,
I like to get some advice/tips on studying the King's Indian.
The problem I face: there's are a lot of video's here on chess.com and the KI knows also a lot of variations so I'm a bit lost on where to start and wich route to take (what variations are most preferable to learn ?)
Any tips on it will be very well appriciated by me.
Greetings,
Ronald
Hate to burst your bubble, but openings are not your issue, and the last thing you should be spending time on.
Super, thanks all of you for your comments 
I can profit from that.
And pfren, of course I don't blunder on purpose and I also study the tactics, I try to study from all sides (tactics, openings, GM games and analysing my own games) but time is a scarcity as you might now.....
the best way to study it is to not study it
Can only concur (Bronstein and Vainstain produced a marvellous piece of chess literature there). Bronstein was (together with Isaac Boleslavsky) one of the great pioneers of the King's Indian in 40s and 50s. He's also a written a book called 'Bronstein on the King's Indian'. It contains 114 games of his own (50 serious tournament games annotated in detail plus another 64 with brief or no notes at all from a variety of events, tournaments, simuls and off-hand games). Just as importantly, the first 1/4 of the book is devoted to standard themes, motifs and manouevres for both Black and White.
Can only concur (Bronstein and Vainstain produced ...
A sample can be seen at:
http://store.doverpublications.com/0486238008.html
Wow, thank you so much for the above post, really appreciate that !
First Steps: The Queen's Gambit
https://www.newinchess.com/media/wysiwyg/product_pdf/7652.pdf
The Queen's Gambit Declined: Move by Move
https://www.newinchess.com/media/wysiwyg/product_pdf/7743.pdf
Starting Out: The King's Indian (2002)
https://web.archive.org/web/20140627055734/http://www.chesscafe.com/text/hansen38.pdf
King's Indian Defence Move by Move
https://www.newinchess.com/media/wysiwyg/product_pdf/7736.pdf
I can only concur with DeirdreSkye with regards to the Tartakower Variation of the Queen's Gambit Declined. It's well worth learning the classical openings first.
Several videos are available online. There are loads of instructive games by elite players. Ding Liren and Hikaru Nakamura have won some excellent games with the King's Indian Defence.
Hi,
I like to get some advice/tips on studying the King's Indian.
The problem I face: there's are a lot of video's here on chess.com and the KI knows also a lot of variations so I'm a bit lost on where to start and wich route to take (what variations are most preferable to learn ?)
Any tips on it will be very well appriciated by me.
Greetings,
Ronald