Golang Tutorial for Beginners (Hands-On)
Free, complete Go (Golang) tutorial in learning order: install, modules, syntax through structs, error handling, I/O and JSON, then goroutines, HTTP, databases, testing, security, logging, Docker/Lambda/cgo. 100+ …
Modern JavaScript Tutorial (ES6+ Hands-On)
Free, hands-on JavaScript tutorial - strings, numbers, arrays, objects, ES6+ features, classes, async/await, the DOM, error handling, and common error fixes. 75+ runnable lessons covering modern JavaScript. Each linked …
Compare Structs, Slices, and Maps in Go (Equality and Deep Equality)
Learn how to compare two structs, slices, and maps in Go: struct equality with ==, slice and map checks with slices.Equal and maps.Equal (Go 1.21+), reflect.DeepEqual, test-focused go-cmp, and when to write your own …
Copy Structs in Go: Value Assignment, Pointers, Shallow vs Deep
Copy structs in Go: assignment copies the struct value; fields that are slices, maps, or pointers still alias shared backing data unless you duplicate them; primitives and arrays inside the struct copy by value.
Golang UDP server and client: ListenPacket, DialUDP, and sending packets
Golang udp server and udp server golang with net.ListenPacket, golang udp client and go udp server patterns with DialUDP, golang send udp packet via WriteTo and Write, plus a minimal udp example for go udp and golang udp …
Golang TCP server and client: step-by-step from basic to advanced
Step-by-step golang tcp server and golang tcp client: net.Listen and net.Dial, tcp server golang and tcp client golang patterns, deadlines and concurrent accepts with the net package.
Java Type Casting Explained [Easy Examples]
The Java type casting is a method or process that converts a data type into another data type in both ways manually and automatically.
Python shelve Module — Persistent Dict-Like Storage
Learn Python shelve for persistent dict-like storage: open(), read/write, access flags, writeback, sync(), thread safety limits, security, and when to use SQLite instead.
Bash case Statement (Switch Case)
Learn bash case statement (switch case) syntax with examples: match patterns, parse script arguments, default clause, case-insensitive matching, glob patterns, getopts integration, and ;;& fall-through in Bash 4+.
Shell Scripting & Bash Tutorial (Free Course)
Free Bash and shell scripting course for Linux — arguments, variables, loops, functions, arrays, real scripts, and automation patterns. 30+ hands-on lessons organized into chapters; examples tested on Bash on RHEL, …
Python requests
Learn how to use Python requests for HTTPS GET and POST requests. Install requests with pip, check response.status_code, handle 200 responses, use raise_for_status(), set timeouts, and compare requests with urllib and …
Java Tutorial for Beginners (with examples)
Free, complete Java tutorial for beginners - install JDK, variables, operators, control flow, OOP, collections, streams, lambda, multithreading, file I/O, regex, and exception handling. 80+ tested lessons on Java 17/21 …
Reverse String in Python
Learn how to reverse a string in Python using slicing, reversed() with join(), for loop, and while loop. Understand why string[::-1] is the simplest method and avoid common mistakes.
Python subprocess: Run Shell Commands
Learn how to run shell commands in Python with subprocess.run(). Capture output, check return codes, handle errors, set timeouts, run multiple commands sequentially, and compare subprocess with os.system and os.popen.
Python pow() Function
Learn how Python pow() works with examples. Use pow(base, exp), the ** power operator, math.pow(), and pow(base, exp, mod) for modular exponentiation. Understand return types, negative powers, errors, and common …
Round Up in Python
Learn how to round up in Python using math.ceil(), decimal rounding, ceiling division, NumPy ceil(), and custom multiples. Understand why round() is not the same as rounding up and avoid common rounding mistakes.
Remove Element from List in Python
Learn how to remove elements from a Python list using remove(), pop(), del, clear(), and list comprehension. Remove by value, index, slice, condition, duplicate values, or all items with practical examples.
Write CSV in Python
Learn how to write CSV files in Python using the built-in csv module. See examples with csv.writer, writerow(), writerows(), headers, append mode, DictWriter, custom delimiters, newline handling, and pandas to_csv().
Python Reverse Range
Learn how to use Python range in reverse order. See examples with range(start, stop, -1), reversed(range()), reverse for loops, backward counting, custom steps, indexes, and common mistakes.
Python range()
Learn how Python range() works with examples. Use range() in for loops, understand start, stop, and step, create reverse ranges, convert range to list, use negative steps, and avoid common range mistakes.
Pylint
Learn what Pylint is and how to use it in Python. Install Pylint with pip, run it on files or projects, understand common messages, fix snake_case naming warnings, disable rules, and configure Pylint with pyproject.toml …
Python pwd Module
Learn how to use the Python pwd module on Unix/Linux systems. See examples for pwd.getpwnam(), pwd.getpwuid(), pwd.getpwall(), struct_passwd fields, current user lookup, Windows availability, and common errors.
Python Progress Bar
Learn how to create a progress bar in Python using print(), carriage return, sys.stdout.flush(), tqdm, progressbar2, and alive-progress. See examples for terminal loops, file processing, downloads, asyncio, and common …
Print Variable in Python
Learn how to print a variable in Python using print(), f-strings, commas, str.format(), and % formatting. See examples for printing strings, numbers, multiple variables, text with variables, and avoiding common TypeError …
Python sorted() Function
Learn how Python sorted() works with examples. Understand the difference between sort() and sorted(), sort lists, tuples, strings, dictionaries, use key functions, reverse=True, lambda, and custom sorting.
Python struct Module
Learn how to use the Python struct module to pack and unpack binary data. See examples for struct.pack(), struct.unpack(), struct.calcsize(), byte order, format strings, pack_into(), unpack_from(), and common errors.
Python try except
Learn how Python try except works with simple examples. See how to catch specific exceptions, handle multiple exceptions, use else and finally, raise exceptions, and avoid common mistakes.
Python input() Function
Learn how Python input() works, why it returns a string, how to convert input to int or float, handle non-numeric values, validate user input, take multiple inputs, and use input with asyncio.
Python UUID
Learn how to generate UUIDs in Python using the built-in uuid module. See examples of uuid4(), uuid1(), uuid3(), uuid5(), GUIDs, short UUIDs, UUID strings, hex values, and when to use each version.
Sort List in Reverse Alphabetical Order in Python
Learn how to sort a Python list in reverse alphabetical order using sort(reverse=True) and sorted(reverse=True). Also see how to solve the short_names exercise and choose between in-place sorting and creating a new list.