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basic data types
     showStructure
     functions and function closures
     symbols and symbol closures
     strings and nets
     basic lists of various types
     mutable lists
     hash tables, hash codes, buckets (debug Core)
     === vs. ==
     sets (sets of ideals aren't really possible -- a new data type is needed)
     how to choose good keys for hash tables and option tables
          x.c versus x#"c" in hash tables
     mutable hash tables
     mathematical objects
        peek inside some polynomials, rings, modules, and ideals
        where do method functions get stored?
     cache tables

good coding style
     short code is good
         avoid redundant parentheses and redundant "return"
	 avoid duplication of code
	    e.g.:
	       flatten entries gens gb I
	       invent an abbreviation, such as
		  GroebnerBasis _* := G -> flatten gens G
     indentation
     our preferred order for arguments
     	 symmetricPower(k,M); symmetricPower_k M
     avoid order N algorithms (e.g., mutable list growth)
     "for" versus "scan" and "apply" ?  (just for lists)
     see also https://github.com/Macaulay2/M2/wiki/Package-Writing-Style-Guide

inheritance, parent, class, ancestor, method functions

new types of things
     give a brief example
     	  how about a type of list with no enclosing brackets for the nets?