stack, segment-tree, tree-array
c/c++, node, golang, rust, jvm(java, groovy, scala..), type theories, paradigms, etc.
queue, set, linked list, heap, stack, hash-table, trie, b tree, b+ tree, red-black tree, splay tree, dfs, bfs, quick sort, heap sort, binary search, dynamic programming, dijkstra, floyd, hash(crc32, md5), math(number theory, linear algebra, 3D-math), etc.
runtime(os, virtualization, interpreters, container..), design patterns, models(concurrency, memory..), mechanisms(gc, transactional..), theories, rfcs, etc.
spring-boot, boost, express, vue, protobuf, zookeeper, hadoop, antlr, ionic, gtk, openGL, qt, etc.
relational(mysql..), document(mongodb..), time-serials(timescale..), key-value(redis..), graph(neo4j..), wild-column(cassandra..), event(event-store..), fs, hd, etc.
message-queue(rabbitmq, rocketmq, kafka..), etc.
tcp/ip, https, http2.0, sdn, bluetooth, firewalls, etc.
c/s, b/s, p2p, distributed systems, decentralized systems, plugin, HA, micro services, serverless, faas, cloud infrastructure, etc.
methodologies, debugging, deployment, tools, testing, mainteance, performance, docs, CI/CD, security, monitoring, etc.
Surfing, Snowboarding, Cycling...