
jetzt
now
Refers to the present moment; at this moment.
Ich kann nicht telefonieren, ich esse gerade jetzt.
I can't talk on the phone; I'm eating right now.
now
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now
Refers to the present moment; at this moment.
Ich kann nicht telefonieren, ich esse gerade jetzt.
I can't talk on the phone; I'm eating right now.

now
Introduces a consequence or is used to emphasize a statement, often with impatience or determination.
So, jetzt reicht es mir aber mit dem Lärm!
Right, now I've had enough of the noise!

nowadays
Refers to the present day or the current era, in contrast to the past.
Die Jugend von jetzt hat ganz andere Möglichkeiten als früher.
The youth of today have completely different opportunities than in the past.

from now on
Means 'from this moment onward', looking toward the future.
Ab jetzt werde ich jeden Tag Sport machen.
From now on, I will exercise every day.
'Jetzt' (now) can be placed flexibly in a sentence. In position 1, it emphasizes the time and requires inversion (verb in position 2). Within the sentence, it usually comes after the conjugated verb.
Jetzt fängt der Film an.
Now the film is starting.
'Jetzt' (now) can also express an emotional reaction such as impatience or determination. In this case, it marks less a point in time and more a consequence or turning point.
Jetzt hör aber auf damit!
Now stop that!
When 'jetzt' (now) is used in contrast to the past (e.g., with words like 'früher' (formerly/in the past)), it refers not only to the moment but to the entire present day or era.
Früher war alles aus Holz, jetzt ist vieles aus Plastik.
In the past, everything was made of wood; now many things are made of plastic.
The expression 'ab jetzt' (from now on) marks a starting point in the present and looks toward the future. It means 'from this moment onward'.
Ab jetzt rauche ich nicht mehr.
From now on, I won't smoke anymore.
here
In a sequence of steps, “hier” refers to a particular point or step. “Jetzt,” by contrast, refers to the present moment. Use “hier” when you want to point to a place in the sequence; use “jetzt” when the current moment is what matters.

Jetzt wechseln wir im Ablauf zum nächsten Schritt.
Now, we move on to the next step in the process.
Hier wechseln wir im Ablauf zum nächsten Schritt.
Here, we move on to the next step in the process.