Vocal warm-ups

Hey I'm new to singing,

When I watch your videos and warm-ups,

I don't know what is the difference between a low head voice and a low chest voice..or high.

And the warm-ups I don't know how high or what area of the voice to sing in

Hi, Yosef! In general, use chest voice for your low to medium pitches and head voice for your highest pitches. We work on developing mix/middle voice to help bridge the two!

As for following along with videos, you can always drop out if an exercise gets too high or low to be sung comfortably. But before dropping out, try three things:

1. Modify the exercise to make it easier (ie: sing on a lip trill, hum or NN/NG instead of an open vowel or other syllable, if that's more doable). 

2. Sing most of the exercise, and just "think" (audiate, or sing in your head) the pitches you can't reach without straining or going sharp/flat. This gives your vocal folds an opportunity to still adjust and prepare to sing those out-of-reach pitches, even if just air comes out. 

3. Make sure you're shifting registers when necessary. For example, you may be unable to sing higher pitches because you're still in chest voice, in which case you'd need to "shift gears" and find your head voice placement.