What were the best cybersecurity courses you ever had?

I periodically look for various information about new training courses or educational material. I've been in cybersecurity for many years, but I'm still curious about what's on the market now.
I worked as a SOC Engineer-Analyst, then moved to SecOps and this training material had a high impact on me and my career:

[networkdefense.io](https://networkdefense.io):

* Investigation theory
* Practical threat hunting

Also, Network Security Monitoring book by Chris Sanders

Active Countermeasures:

* Practical Network Threat Hunting

Antisyphon:

* SOC core …

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