Not sure what hairstyle to choose? Here are a few trendy men's hairstyles that are popular:

Undercut or very short haircuts with shaved temples and the back of the head.
Undercut (undercut to zero or very short hair with long upper hair that can be styled forward or backward).
Trimmer style (short hair cut using a trimmer in various lengths and shapes).
Classic trimmed top with short sides and nape.
Boxer style (short hair with a slightly longer top that can be styled forward or backward).
Grunge style (matte, sloppy hair with texture and volume).
Pomadour (hairstyle with a raised top and side hair, creating a classic retro style).
A fade cut (a smooth transition from short hair to longer hair at the top with a gradual transition haircut).
Remember that hair trends can change over time, so it's best to choose a style that fits your personal style and hair type.