The inventors of the search engines are fucking saints. Alright, this is what I got:

trascrittore's icon is the hand signs involved in the Aaronic Blessing, an ancient Jewish ritual. The banner is Greek for "beauty in misery". The channel blurb is from a 15th century play known as "Everyman"

bodeh lᵉkhidah chuldah

trascrittore seems to be creeping around someone's house, and incites someone to come outside.

The text on the paper is Hebrew: "ישב בסתו עליןך בצל אמר-ליהוה מחסי ומעורה" which is the original text of Psalm 91:1-2, translating to: "He who dwells in the covert of the Most High will lodge in the shadow of the Almighty. I shall say of the Lord, my shelter and my fortress, my God in Whom I trust."

trascrittore does something to the filmer, as evident by the fact footage stops on a moan, and suddenly cuts to trees. trascrittore seems to have some affinity for trees.

Next video is "decision". As /u/hopeabandoner points out, the audio translates to "knife or gun". The image is the Hebrew letter yod. Not sure of the significance.

Next video.

patience

Simply trascrittore sitting in a chair and making the hand sign from the icon. Description tells us trascrittore got sick of waiting and decided.

lorumipsum

Video title means "pain itself." Footage of trees, trascrittore really likes trees. Again, hopeabadoner pointed out it contained a spectrogram telling us trascrittore chose knife.

beginnings

trascrittore is holding a knife. Seems like he's about to torture somebody.

history

This one seems really out of place. The video seems to indicate trascrittore is a copycat killer who's following the methods of another person. It seems another hooded man is dragging out someone onto train tracks, presumably killing them, and then going on a boat.

That's all I got so far.