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Lapo Luchini created a useful decoder for ASN.1. For me it’s useful for doing in-depth inspection of X.509 certificates and signing requests. https://lapo.it/asn1js/

Michael Driscoll created a very nice illustrated guide on how the TLS 1.2 and TLS 1.3 handshakes work, including how the various cryptographic primitives are used to secure the connection. TLS 1.3: https://tls13.xargs.org/ TLS 1.2: https://tls12.xargs.org/ Bonus: An animated explanation on how elliptic curve crypto works: https://curves.xargs.org/