There are some examples of Present Perfect Tense:
I haven't seen her today.
My phone's run out of battery. Can I use yours?
Have you ever dyed your hair a different colour?

We use the Present Perfect Simple for:
*something that is true in the present:
*something that happens regularly in the present
*something that is always true:

Present Perfect Simple is used to say what we've done in an unfinished time period

We use the present perfect simple (have or has + past participle) to talk about past actions or states which are still connected to the present.

Present Perfect simple is used to refer to actions that were completed in a time period before the present time.