When machine embroidering what count thread do u use. And what kind. Is there diffence like cotton, polyester? Thanks for your help

I use Isacord thread

The best thread to do embroidery with is embroidery thread, Other thread can be used but there is more lint and sometimes you have to adjust the tension. I am not in my sewing room so I can't check the weight of my favorite brand.

Anton Robinson Rayon or Poly

I tried Rayon thread due to the great number of colors available (and the major availablitliy of it), but my machine does not like rayon. It would shred in the machine. I use polyester only. I have some Poly 40X and Coats and Clark trilobal polyester.
I think it depends on your machine. My advice: don't buy a TON of colors until you figure out what your machine likes. And, give yourself time to figure it out!
Happy sewing

I have a Janome 8000 I use Janome acryl 100% #50, or the Rayon 40 wt. by coats & clark, My machine isn't to fussy but does like the blue tip embroidery needles made for embroidery but I agree with buckyfan19 try a few with different needles sometimes think also what you are sewing on!

I agree - These are my favorites,

I mainly use Isacord, but have used Robison-Anton. I also use polyester for the most part.

mltquilt

Almost all embroidery thread is 40 wt. At least the 5 different brands I have are 40 wt.

You shouldn't have a shredding problem if you use an embroidery needle either 75/11 or 80/12. The correct needle is the key to successful embroidery. I love Sulky 40 wt., also Robison Anton is good, or Madeira.