Is the Anime4you website legal?

A friend of mine recommended this website to watch anime but I wonder if this website is legal or illegal and if it is illegal where you can watch anime but legal (except Netflix)

No.

The site is not legal.

The page you named links illegally uploaded anime and, according to a judgment of the CJEU, looking on such sites is also illegal.

Here are a few legal pages:

Free and legal:
Anime2You (in cooperation with Wakanim), Crunchyroll, Netzkino, Prosieben MAXX, TV NOW (formerly Watchbox, website), Wakanim

Paid and legal:
Amazon Prime Video, Animax, Anime on Demand, Crunchyroll (Premium), Netflix, Rakuten TV, Steam, TV NOW (Premium, App), Wakanim (Premium)

Is "Anime Stream" from Illegal?

Yes, also illegal.

No, it is illegal. Anime2you, on the other hand, is legal. A news site that cooperates with the streaming provider Wakanim.