My personal mental model of the two functions is this:
Say you have a (current) tiddler titled "My first tiddler".
<$wikify name=tid text={{!!title}}>
puts a (rendered) string into the variable, <<tid>> is equal to the text "My
first tiddler".
<$set name=tid value={{!!title}}>
puts "{{!!title}}" into the variable <<tid>> which in *some* contexts would be
replaced with "My first tiddler" – but in the context of another current
tiddler it would be replaced with the other tiddler’s title.
As a macro parameter the wikified <<tid>> inputs "My first tiddler" into the
macro, but the set <<tid>> inputs "{{!!title}}" – the first can be used as an
id, the second can’t.
Maybe this is not 100% scientific, but it helps me a lot!
All the best!
Thomas
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