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Chasing 100M Daily Users, Duolingo Reconsiders Ads, Paying Influencers, and Its Most Expensive Plan

AI got cheap enough that Duolingo’s most expensive plan may not survive it. I read the earnings call transcript and opened the app to see what is actually changing for learners.

Dhawal Shah Sep 03, 2026

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Effective Observability with OpenTelemetry

See how OpenTelemetry supports modernizing application observability, including its pillars and span context.
- YouTube
- 41 minutes
- Self-Paced
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Open Source with a Security Mindset - Releasing with Protection

A security-minded look at protecting open-source software releases.
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SLIs, SLAs, and SLOs - Learning About Service Uptime from Homer Simpson

A Homer Simpson–themed introduction to measuring service uptime through service-level indicators and agreements.
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- 48 minutes
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Introduction to the Embedded Boot Loader U-Boot

An introduction to U-Boot, the boot loader used in embedded systems.
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Device Tree, Linux Board Bring-up and Kernel Version Changing Tutorial

A practical review of lessons learned using Device Tree during Linux board bring-up and kernel version changes.
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- 1 hour 36 minutes
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Debugging Embedded Devices Using GDB - A Review of Lessons Learned

A review of lessons learned while using GDB to debug embedded devices.
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Container Security 101

An introductory tutorial on securing containers.
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Systemd - The Adventure Continues

A tutorial continuing an exploration of systemd.
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Introduction to I2C and SPI - In-kernel and In-userspace

A practical introduction to using I2C and SPI from both the Linux kernel and userspace.
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Managing Data Consistency Among Microservices with Debezium

A demonstration of keeping microservice data consistent by capturing database changes with Debezium and streaming events through Kafka.
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Spelunking for Hardware Data Tutorial

A tutorial on exploring hardware data.
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Bashful to Bold - A Bash Primer

An introductory tutorial for moving from bashful to bold with Bash.
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Container Kernel Development

A look at Linux kernel changes for container management, from retrieving process file descriptors to placing containers directly into cgroups.
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Using Linux Primitives to Build Your Own Containers

A tutorial on building containers from the low-level primitives provided by Linux.
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Better Data Security with Commodity TPM Chips

See how commodity TPM chips support stronger data security through boot measurements, key management, application interfaces, and authentication.
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