[rubolf]

The Legendary Moonlight Sculptor, The Beginning After the End, Nano Machine, Magic Emperor, Solo Leveling, Tales of Demons and Gods, Bowblade Spirit, Martial Peak, Weak Hero, The Boxer.
I can give you more list if you want. btw they are all manga

[GraceMcLean]

If you want a great old anime, Try Shaman King, it is my first anime

[Simbu]

I would suggest "Dan Detective School Q" for old anime it's very interesting and is about Detectives solving Crime.

For latest anime I would suggest Black Clover as it is fast paced and great story line.

One Piece is a must watch anime if you have time.
It's going strong even after crossing 950+ episodes its a great adventure in itself.

[Stillski]

For Old anime I would suggest " Captain Tsubasa"
And for
New anime I would Suggest "Fire Force"

[Maality]

For old anime I would choose Sailor Moon
And
For New anime I would choose Fire Force.

[Alex1759]

Gintama - Nothing has made me laugh so hard ever + badass action

[Greenleaf]

Dan Detective School Q is a short detective anime, very interesting to watch.
Try to watch Law of Ueki also a great anime, original story line. Amazing concept and battles.

[Miamoo]

Try to Watch Mobile Suit Gundam, its one of the most original anime. Which started the Love of Robots in Japan. Good Story line , very engaging to watch.
FLower of Escaflowne is also a great anime, very interesting and good to watch.
If you want to go for short watch would suggest Accel World, nice anime.

[Alex1759]

If you have much time then watch Cowboy Bebop or Full Metal Alchemist:Brotherhood. You may become addicts of these animes

[Miamoo]

I always recommend People to watch Mobile Suit Gundam, it just opens up the infinity possibility in anime. Such as great vision even in those early days of anime. And Black Clover from latest anime, great animation, awesome fight scenes. Especially the fight scene between Asta, Dante with Yami was off the charts.