Excellent post on learning effective Clojure and Smalltalk: https://lambdaisland.com/blog/29-12-2017-the-bare-minimum-clojure-mayonnaise
They have different paradigms, and you need to approach them with different tools (and Emacs is not obligatory!)
miniblog.
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Some excellent safety improvements in C++26: hardening the standard library against out-of-bounds bugs, and a safer semantics for uninitialised local variables:
Excellent series on Self, both the programming model and the tool chain.
I love how opening an inspector on a value (e.g. nil) then shows a link to all occurrences of the value in other open inspectors!
The Matter protocol is excellent for puns.
"Does it Matter? It doesn't Matter."