Collection news and reading notes for July–September 2026.
Published 15 September 2026. The July and August entries are themed reading notes, not claims of earlier releases or course changes.
The collection is organised into ten guides, from first Kotlin expressions to a written project study. Each course page shows its scope, prerequisites, and price in EUR. Start with Free Kit if you are still learning to read Kotlin syntax.
View Free Kit ↗A nullable type makes room for a missing value. Before using a safe call or a fallback, decide what that missing value means in the problem. A missing name and an invalid record may need different handling. This is the focus of Layer Library.
Explore null safety ↗When reading a chain of collection operations, write down the values after each step. A filter decides what stays; a map describes what each remaining value becomes. Keeping those questions separate makes an example easier to trace.
Explore collections ↗
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