On a serious note, you should not skip it. There are many references of DS2 in DS3 such as items and characters, even the new DLC of DS3 will contain some areas from DS2. Probably. Unless you feel like dealing with ludicrous lock-on and swarms of enemies.
Do I need to play Dark Souls 2?
No, its not necessary. You are able to complete DS3 and understand it till some point without any background in series. But experience with previous games will help you: in understanding basic game mechanics like bonfires, weapon scaling and movesets, etc.
Will there be a Dark Souls 2 remastered?
It will be available for PlayStation 3 and Xbox 360, but Dark Souls 2 global producer Atsuo Yoshimura is focused on the PlayStation 4, Xbox One and PC versions of the upcoming release. This is not just a remaster, Yoshimura tells Polygon. Its almost recreating the game.
Which is harder Sekiro or ghost of Tsushima?
Ghost of Tsushima will not be as hard as Sekiro, nor any of the Souls games. Sekiro does not, and will not, compromise on the challenge that it throws at you. You either learn, adopt, and succeed, or you will end up stuck and walled by a boss forever. You will miss more than half of the games content if this happens.