[tex-eplain] tex macro-HELP

[Zero M]

hi all,

I am a new babie in TeX. 

my project is to write a tex file similar to plain.tex


I am not able to understand the plain.tex. please help
me with any documentation.

I like to know how to write advance TeX macros and how
it works during the tex compliation


kindly help me
1. where i can start 
3. what are the site
4. what are the search keyword

thanx & regards

Zemi

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