i wouldnt recommend youtube, but anime heaven. it has lost girls, Attack on Titan OVA, Attack on Titan no regrets, and the 1st and seacond season of Attack on Titan. it even has other animes, plus it is currently putting episodes of Attack on Titan season 3!!
season 1: http://animeheaven.eu/i.php?a=Attack%20on%20Titan
season 2: http://animeheaven.eu/i.php?a=Attack%20on%20Titan%202nd%20Season
season 3: http://animeheaven.eu/i.php?a=Attack%20on%20Titan%203
Attack on Titan OVA, it also has AOT no regrets which is basically Levi's back story: http://animeheaven.eu/i.php?a=Attack%20on%20Titan%20OVA
AOT lost girls: http://animeheaven.eu/i.php?a=Attack%20on%20Titan%20-%20Lost%20Girls%20OVA
Attack on Titan Junior High: http://animeheaven.eu/i.php?a=Attack%20on%20Titan%20-%20Junior%20High
i recommomend watching on PC (computer, laptop, etc.) so yea. have fun!!! you'll get drawn in real quick!
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Attack on Titan for beginners
Fanfictionwant to watch the anime Attack on Titan? but have no idea what it is or you think it's too confusing? read this. it will help understand why/how things happen and more! feel free to ask questions!! the guide to aot to help you understand inside joke...