One of the biggest myths in tech is that you need a $500+ "Elite" course to pass Big Tech interviews. In reality, the best engineers often use the exact same free resources available to everyone.
Based on the latest guide from Engineer Talks, here are the top 5 free resources and a proven strategy to master DSA from scratch.
The Master Strategy: Don't "Resource Hop" 🚫
Before we dive in, remember this: Mastering one resource is better than finishing 10% of five different ones. Stick to a plan and finish the curriculum before moving on.
1. Pepcoding (Best for Learning Concepts) 🎓
If you are a beginner or find certain topics (like Dynamic Programming) confusing, start here.
- Why it works: The explanations break down complex logic into understandable segments.
- The Starting Point: Check out the "Level 1" playlist for a complete scratch-to-pro journey.
- Deep Dives: They have specialized playlists for Linked Lists, Binary Trees, and DP that are goldmines for interview prep.
2. LeetCode (The Practice Standard) 💻
This is the industry standard for coding practice. Use it to transition from "understanding" a concept to "implementing" it under constraints.
- Filtering: Use tags to solve topic-wise problems and sort by difficulty (Start with Easy, move to Medium).
- Discussion Forum: If your code is slow, the discussion tab is where you learn how to optimize time and space complexity from the community.
3. GeeksforGeeks (The Company Specific Cheat Code) 🏢
GFG is unbeatable when it comes to Company-Specific preparation.
- The Strategy: Two weeks before your interview with a specific company, go to GFG and read their "Interview Experiences".
- Patterns: This helps you identify the specific types of questions a company likes to ask (e.g., Amazon loves Trees; Google loves Graphs).
4. InterviewBit (The Time-Management Tool) ⏱️
In a real interview, you usually have 45 minutes to solve 2 problems. Speed and accuracy matter.
- Timed Practice: InterviewBit forces you to solve problems against a clock, simulating the pressure of a real interview.
- Pro Tip: Find a question on GFG to understand it, then find the same question on InterviewBit to solve it under time pressure.
5. Techie Delight (For "Off-Road" Problems) 🛠️
Once you have exhausted LeetCode or want a fresh challenge, Techie Delight offers unique problems that don't always appear on mainstream platforms. It's a great "final boss" resource before you start your actual interview loop.
Honorable Mentions 🎖️
- MyCodeSchool: One of the best places for absolute beginners to learn about Pointers, Recursion, and basic Sorting [00:07:09].
My Recommended Roadmap:
- Learn core concepts from Pepcoding.
- Practice implementation on LeetCode.
- Refine your speed on InterviewBit.
- Target specific companies using GeeksforGeeks.
Which resource helped you the most in your last interview? Let’s share the knowledge in the comments! 👇
Inspired by the Engineer Talks guide on free DSA resources. Watch the full video here.
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