2. «No» is not always necessary. You can also use a negative word in place of “no” or use a negative word alone in certain circumstances.
Nunca dice nada. (He never says anything.)
3. You always need a negative expression before the verbs.
Nadie vino a la fiesta. (Nobody came to the party.)
No vino a la fiesta nadie. (Nobody came to the party.)
4. Also never separate direct or indirect object pronouns from the verb. Place the negative word in front of these pronouns.
No me gusta el vino. (I don’t like wine.)
No lo hagas. (Don’t do it.)
You can also learn more about this topic by clicking on this link «negatives and short questions in Spanish«.