Basic negation is formed by placing no before the conjugated verb.
A mis hijos siempre les dije — Miren, a mí no me importa lo que hagan, pero aprendan a escribir bien.I always told my kids, “Look I don’t care what you do but learn to write well”.
As no is placed before the conjugated verb, in compound tenses, like the present perfect, no is placed before the auxiliary verb haber. In the periphrastic future, no goes before the conjugated form of ir.
Usted trae experiencias que… que ellos no han tenido en su vida.You bring experiences that they haven’t had in their life.