IT Career Guides & Free Resources
Expert roadmaps, tutorials, salary guides and interview prep across Data Science, Generative AI, Python, Cloud & Analytics — written by GloryTecks trainers in Hyderabad.
Featured Guides
Data Science Roadmap 2026: A Complete Step-by-Step Guide
A data science roadmap in dependency order, from Python and SQL through cleaning, statistics and honest model evaluation to communicating results, with an exit test at every stage and one dataset that carries through the whole path.
What Is Generative AI? A Complete Beginner's Guide
What generative AI is, in plain language: how language models produce text one token at a time (shown with a tiny runnable model), how chat models are trained, how image models differ, what the technology is reliable for, and why it confabulates.
Learn Python from Scratch: A Complete 2026 Roadmap
How to learn Python from zero: install a current version (including the new Windows install manager), then work through seven stages, from values and loops to files, virtual environments, classes and tests, each ending with a small program you should be able to write on your own.
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Azure Data Engineer Certification (DP-203) Guide
Exam DP-203 and the Azure Data Engineer Associate certification were retired on 31 March 2025. This guide explains what that means for people who hold it or were studying for it, what the exam covered, how the Fabric Data Engineer Associate exam DP-700 differs, and how to plan your preparation now.
Slowly Changing Dimensions (SCD) Types Explained
The slowly changing dimension types every data engineer uses: Type 0, 1, 2 and 3 and when each fits, a working example on the real Chinook database where a support-rep reassignment makes Type 1 misattribute revenue while Type 2 keeps it right, how to load Type 2 rows, and the mistakes that corrupt history.
Power BI Performance Tuning: Make Reports Faster
A method for making Power BI reports faster: measure first with Performance Analyzer and read its DAX query, visual display and other timings, then shrink the import model, reduce column cardinality on a real retail dataset, write lighter DAX, filter and simplify pages, and check capacity and gateways.
Snowflake Explained: The Cloud Data Warehouse
Snowflake explained for data engineers: the three layers of storage, compute and cloud services, why separate virtual warehouses isolate workloads, how credits and per-second billing work with a worked example, micro-partitions and pruning, Time Travel and cloning, and habits that keep performance up and costs down.
Chunking Strategies for RAG: Getting Retrieval Right
How you cut documents into chunks decides what a RAG system can find. This guide tests five chunking strategies on the same 40 questions and finds no single winner: splitting rescued facts buried in long sections, lost others that needed their surroundings, and section titles mattered more than size or overlap.
Tableau Interview Questions and Answers
Tableau interviews return to one topic more than any other: when each calculation happens. This guide answers the core questions on FIXED, INCLUDE and table calculations, with the Tableau formulas and their results reproduced on a year of real online orders: one filter, two answers, 100% or 2.57%.