Can you please explain idhhar and idhgam ?

Question
asalamu alaykium wa rahmatullahi  wa barakaatuh. Can you please explain idhhar and idhgam ? and i want riwaayah hafsah binu casim
jazakallaahu khayraah.

Answer
Wa alaikum assalaam wa rahmatullahi wa barakatuh
The concepts of idh-har and idghaam for Hafs 'an 'Aasim -Which is the the riwaayah you are referring to but with some typo errors - are explained in the following lessons on this site.  Please click on the links:

http://www.abouttajweed.com/the-noon-saakinah-and-tanween/the-making-clear-of-the-noon-saakinah-and-ta.html
http://www.abouttajweed.com/the-noon-saakinah-and-tanween/merging-of-the-noon-saakinah-and-tanween-p-2.html

Wa iyyaakum