Software Design Patterns Crash Course: Free Video Guide

Software Design Patterns is a short crash course on classic design patterns, the proven, reusable solutions to problems that come up again and again in object-oriented code. It is for developers who can already write working programs and now want to structure them better, and for anyone preparing for interviews where design patterns are a common topic.

The course explains nine patterns, one per video: factory method, builder, abstract factory, singleton, bridge, composite, decorator, proxy and chain of responsibility. It has 10 videos, about 38 minutes in total, free on YouTube and listed on the software design patterns course page.

Who this course is for

• Junior and mid-level developers who keep hearing pattern names in code reviews and want to know what they mean.
• Interview candidates who need clear, quick explanations of the most-asked patterns.
• Self-taught programmers who want shared vocabulary for talking about code design.
• Experienced developers who want a fast refresher before a design discussion.

The catalog marks it Intermediate. You should be comfortable with classes, objects and interfaces in at least one object-oriented language.

What you will learn

The patterns in this course come from the three classic families: creational, structural and behavioural. Grouping them this way makes it easier to remember which problem each one solves.

1. Creational patterns: how objects get made.

• Factory Method lets code create objects without being tied to their exact class.
• Builder Pattern builds complex objects step by step.
• Abstract Factory creates whole families of related objects that belong together.
• Singleton Pattern makes sure only one instance of a class exists. At about 6 minutes, it is the longest lesson, which fits a pattern that is easy to use and easy to misuse.

2. Structural patterns: how objects fit together.

• Bridge Pattern separates an abstraction from its implementation so the two can change independently.
• Composite Pattern treats single objects and groups of objects the same way, as with files and folders.
• Decorator Pattern adds behaviour to an object without changing its class.
• Proxy Pattern puts a stand-in in front of an object to control access to it.

3. Behavioural patterns: how objects share work.

• Chain of Responsibility Pattern Explained passes a request along a chain of handlers until one of them deals with it.

Each pattern is a name for a design decision. Once you know the names, you can recognise them in frameworks you already use and discuss designs much more precisely with your team.

A word of balance: patterns are tools, not goals. Adding one where the problem does not exist makes code harder to read, not easier. As you watch each video, ask “what would this code look like without the pattern?” If the simpler version works just as well, keep it simple.

How the course is organised

There are 10 videos and about 38 minutes in total:

• Video 1: the crash course introduction.
• Videos 2–5: creational patterns (factory method, builder, abstract factory, singleton).
• Videos 6–9: structural patterns (bridge, composite, decorator, proxy).
• Video 10: a behavioural pattern (chain of responsibility).

Each video is about three to six minutes long and stands on its own, so after the introduction you can watch them in order or jump to the pattern you need.

How to study it step by step

1. Watch the introduction to see what a design pattern is and why it helps.
2. Watch one pattern at a time, then pause and write down, in one sentence, the problem it solves.
3. Code a tiny example of each pattern in your own language. Writing a fifty-line version teaches more than watching several explanations.
4. Compare similar patterns side by side. Factory method and abstract factory are easy to confuse, and so are decorator and proxy. Explaining the difference is a common interview question.
5. Look for the patterns in code you already use. Many frameworks and libraries use builders, decorators and proxies.
6. Revisit the course before interviews. At under 40 minutes, it makes a quick, focused revision session.

This course currently has no Skills Pragati hands-on lab guide, practice simulation or mock exam.

Frequently asked questions

Is the design patterns course free?

Yes. All 10 videos are free on YouTube, and the course page lists them in order.

How long does it take?

About 38 minutes of video. With time to code a small example of each pattern, plan two or three short sessions.

Do I need programming experience?

Yes. The course is rated Intermediate. You should already understand classes, objects and interfaces in an object-oriented language, because patterns are built from those pieces.

What should I take with or after this course?

To practise structuring a small project from scratch, try Pair Programming – Build a CLI App With Python Using GitHub Copilot. If you work on the web, Step By Step Mastering Modern JavaScript covers objects and functions in the language you will apply these patterns in.