By Andrei Gec14 min read7 activitiesLevel: IntermediateVercel's free tier: limits and trade-offs
Learn what Vercel's Hobby plan includes, how its independent usage meters interact, and when a project needs a paid plan.
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View all articlesBy Andrei Gec14 min read7 activitiesLevel: Intermediate
By Andrei Gec16 min read5 activitiesLevel: BeginnerBinary trees
Learn binary tree shapes, depth-first and breadth-first traversals, search-tree invariants, and how height determines performance.
By Andrei Gec12 min read5 activitiesLevel: BeginnerHash tables and dictionaries
Learn how hash tables store key-value pairs, resolve collisions, resize efficiently, and support practical dictionary and set operations.
By Andrei Gec20 min read6 activitiesLevel: BeginnerLinked lists
Build and traverse linked lists, reason about pointer updates and complexity, and choose the right structure for your workload.
By Andrei Gec18 min read5 activitiesLevel: IntermediateGraphQL fundamentals
Build a small GraphQL API and learn how schemas, resolvers, mutations, errors, and query limits shape a reliable client contract.
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