If you’re new to Pluralsight, it can be hard to know where to start: Do I polish up my existing skills, or develop new ones? Which courses and paths should I be focusing on? How will I know if the skills I’m investing time in even matter?

Using insights from the Pluralsight Tech Index—which aggregates billions of data points from eight unique sources to show the relative popularity of the world’s top technologies—we’ve curated some of Pluralsight’s must-watch courses in one easy-to-navigate place so you can get started on the most in-demand technologies, skills and competencies.

This four-part collection focuses on software, IT ops, security and data, but that isn’t all you can do on Pluralsight; use this as a jumping point to explore the rest of the platform and level up your skills.

No surprises here: The biggest programming languages and foundational technologies of the internet dominate the top five software development technologies, so that’s where we’ll start.

(Don’t see your favorite language, library or framework—like React and Angular—in the top five? You can explore the rest of the software development rankings in the Pluralsight Tech Index for courses and paths that are relevant to you.)

With the top five software development technologies in mind, if you want to gain a deep understanding of how to build, deploy and scale everything from websites to mobile apps, this is the place to start.

JavaScript is a scripting language that's used to create anything that moves or automatically refreshes on your screen. JavaScript is easy to pick up, has a huge community and—with more and more businesses going and growing online—offers a lot of career opportunities.

HTML provides the building blocks of web development, and should be one of the first places you start your software development learning.

If you're a fan of the British comedy series, "Monty Python's Flying Circus," you just might want to learn Python. After all, that's where its name comes from. Python is an open-source language that lets you build just about anything you want, and is the official programming language used at Google.

Java is a general-purpose programming language, and it's the most popular programming language for Android applications. Java is used by 95% of enterprises around the world (and the average salary of a Java developer is upwards of $93K, so it pays to know it).

It has a steeper learning curve than some of the newer programming languages, but don't let that stop you: C++ was used to create some of the world's greatest apps, including Adobe Photoshop, Spotify and Amazon.

According to Pluralsight author and expert José Paumard, there’s never been a better time to learn Java programming. Get his expert recommendation for which skills you should master in "5 essential skills for Java developers."

Ever wondered what it actually took to get a man on the moon from the perspective of the “developers” that did it? Long-time developer Simon Allardice’s course on the Apollo 11 mission explores the unsung lynchpin that kept the entire operation together: The Apollo Guidance Computer.

Is Linux the future of enterprise computing? Many think so. At any rate, Linux and Linux-based operating system Ubuntu take two of the top three spots on the Pluralsight Tech Index for IT Ops. Are they on your radar as well?

Build your toolkit with the skills you need to excel in your job, including security best practices, server infrastructure and virtualization.

Linux is everywhere: Smartphones, submarines, spaceships—even Hollywood. If you're interested in a career in IT and you want geek (and street) cred, dive into Linux.

With more and more businesses introducing Macs into the workplace, the demand for IT professionals who are skilled in macOS is on the rise. Working in an all Mac-based environment is rare, which means companies are looking for employees who also know general IT ops, networking, Windows and more.

Ubuntu is a free distribution of the Linux operating system which is fast, easy-to-use, secure and well-supported. If you haven’t explored this free tool, now is the time.

Responsible for the foundation and integrity of your website, your capacity to keep your organization secure will only go as far as your HTTPS skills.

If you're ready to turn your engineering team and IT ops team into one single, superpowered unit, DevOps is for you. Watch this webinar from Pluralsight author and former DevOps consultant Jeremy Morgan to see how you can enable low-risk releases and increase your velocity.

With these technologies and certifications driving your strategic security initiatives, you can be confident you’re deploying security-first mindset to every aspect of your business—from writing secure code to testing vulnerabilities and implementing best practices.

New attacks pop up every day. Protect your bottom line and follow these courses and paths to learn how to stay on top of the next threat.

As one of the most popular pen test and ethical hacking tools in the world, Kali Linux is a veritable Swiss Army knife when it comes to security. It’s also open-source, so you can jump in and get started right away.

Get the foundational knowledge you need to effectively design, engineer, manage and lead the security posture of an organization with a CISSP certification.

Cloudflare—a free services that routes web traffic within their service to provide SSL-enabled sites, firewall rules and security controls—has become rapidly popular in recent years, with five percent of the globe's traffic now dependent on Cloudflare for security.

Learn to start thinking and looking at your network through the eyes of malicious attackers. If you’re ready to become the champion “security profiler” for your team, you’ll first need to learn the difference between hacking and ethical hacking.

This global certification validates baseline skills for security functions for those pursuing a career in IT (or if you just want to add a layer of skills in cybersecurity to your current role).

Find out what to expect from this role and get the skills security expert Richard Harpur recommends to stay at the top of your game, including incident response and proper documentation.

No one wants to be in the news for being hacked, but the consequences of leaking sensitive customer information or having your poor security protocols exposed is worse than just the immediate aftermath. This article by security expert Dale Meredith will help you make sure you’re not next.

Big names like Google and Microsoft dominate the Pluralsight Tech Index’s top five data technologies. But do you have the foundational data of programming languages like R and Python that will take your data skills to the next level?

Explore the tools and platforms driving the world of data and machine learning.

Data literacy and data science are becoming more and more valuable to the workplace and to the global economy. Learn how to use the programming language R to transform your data into tangible insights and action.

Analyze any type of data with Microsoft SQL Server, which lets you use any platform or language of your choice for maximum flexibility in your data science practice.

Get up to speed on the numerical computing environment MATLAB, which serves up matrix manipulation and data plotting for millions of users around the world

No pun intended, but the sky’s the limit to your data skills with Google Analytics. Learn how to explore, mine, load, visualize and extract insights from diverse datasets.

TensorFlow is an open-source machine learning software library developed by Google, and since its release in 2015, it has become one of the most widely-used machine learning libraries in the world.

With the potential for more than $200 billion in revenue this year, the market for big data isn’t going anywhere. Here are the trends driving this cosmic growth.