Downloading or distributing copyrighted episodes of Attack on Titan without authorization is illegal in most jurisdictions. While ISPs may not always pursue individual downloaders, using unlicensed sites exposes you to:
“Attack on Titan Season 1 Episode 1 in 720p quality from a web source, shared via a site called Movies4u, possibly with a ‘bid’ affiliate parameter.” movies4ubidattackontitans01e01720pweb
This denotes the resolution of the video. 720p refers to High Definition (HD) quality with 1280x720 pixels. While 1080p and 4K are now the gold standards, 720p remains popular for quicker downloads and for users with limited bandwidth or older hardware. While 1080p and 4K are now the gold
If you are looking for a "feature" (as in a full-length movie version) of this specific episode or season, you may be referring to the Attack on Titan compilation films AOT episode 1
Attack on Titan, AOT episode 1, Shingeki no Kyojin S1E1, anime review, Colossal Titan, Wall Maria, Eren Mikasa Armin.
The appearance of the Colossal Titan over the 50-meter wall is an iconic image that changed the landscape of dark fantasy.