It doesn't take long after you leave school or college for you to realize that there are some skills and topics you wish you had studied. Unfortunately, once you enter the working world, it becomes almost impossible to find the time for after-hours lessons and courses.

Luckily there are a variety of apps available on Android that can teach you different skills -- from more general learning apps to ones catered towards a specific skill.

Here are some new skills that you can learn using only an app on your phone.

1. Learn a New Language

Android users have a host of language-learning apps to choose from. Your decision should be based on the specific language you want to learn and the way you want to learn it. Languages such as English, Japanese, Mandarin, French, and Spanish are covered by most of the major apps. You can also find apps solely geared towards a specific language.

When choosing an app, take three things into consideration: which language you want to learn, what you want to prioritize, and the quality of the app.

Memrise is an especially interesting language app, as it gamifies your learning. The app also comes with an extensive catalog of languages from around the world.

Meanwhile, Mondly has a great chat bot that can recognize phrases and check your pronunciation. There is one central app, with a series of smaller apps that focus on one language each.

Duolingo is another major player in the language app sphere, and it can remind you daily to keep practicing.

Many of these apps are free, with additional in-app purchases or subscription options if you want to upgrade your experience.

Download: Memrise (Free)

Download: Mondly (Free)

Download: Duolingo (Free)

2. Learn to Code

Software and web developer skills are in high demand across the world, so it's no wonder why many people want to dip their toes into the coding world. Unfortunately, many of us missed out on taking any traditional courses in this field.

But SoloLearn is an app that will let you learn these skills outside of the classroom. It teaches popular coding languages such as C#, JavaScript, and SQL. Rather than acting as an editor to make coding easier, this app is intended to teach or hone coding skills.

Much like Mondly, SoloLearn also has a suite of apps. There is one central SoloLearn app and a variety of supplementary apps that focus on a single coding language each. You can start off with easier coding languages like HTML, or sink your teeth into some of the more complex ones.

Download: SoloLearn (Free)

3. Learn to Play an Instrument

Want to impress people with your music skills but forgot to learn an instrument? Well, Yousician offers a solution for those looking to learn guitar, bass, ukulele, or piano.

The app caters to every skill level -- as long as you have the instrument you want to learn how to play. One great thing about Yousician is that it provides feedback after it listens to you play your instrument. This is something that a guitar book or a site for learning music theory usually can't do.

It also includes tools to help you tune your instrument, and friendly instructors to guide you through tutorials.

Download: Yousician (Free)

4. Learn How to Work Out Better

Most people know how to jog or do jumping jacks, but when it comes to more specialized exercises, those of us who never set foot in a gym might find our knowledge lacking. There are always fitness tracking apps -- but these simply tell you how much your exercising and don't teach you anything new.

There's no need to go hire a personal trainer, though. The Google Play Store is packed with workout and exercise training apps to get you in your best shape. While some of these apps use gimmicks (e.g. "how to get a flab-free belly"), the well-established players in the market actually teach you exercises to meet your specific goals.

For example, FitStadium will let you choose between focusing on cardio and losing weight, or strength training. You can even choose which parts of your body you want to train. FitStadium relies on user feedback to customize routines, especially if exercises are too easy or difficult.

The 7 Minute Workout app is also a favorite for many users. The app accepts that most of us don't have a lot of spare time to do training, so it provides high intensity workouts that take very little time.

You will just need to decide what exactly your fitness goal is and choose an app that will help you get there.

Download: FitStadium (Free) [No longer available]

Download: 7 Minute Workout (Free)

5. Learn About Nearly Anything

There are quite a few educational apps for learning courses from different institutions, but Udemy has some of the best variety. The app boasts over 1,200 topics, though some of those are locked behind in-app purchases. However, there is still a lot you can learn from the free courses.

A great feature is the ability to cast the app to different devices, such as your Chromecast. Instead of huddling over your smartphone, you can comfortably watch lessons and presentations on your television.

The topics covered by the app aren't focused on one or two industries, as is the case with some other online learning apps. Udemy allows you to learn anything from IT to Photography. It also provides training for specific software, such as Microsoft Excel.

Download: Udemy (Free)

Which Apps Do You Use to Learn New Skills?

While this list of apps has some pretty great options, there is a vast landscape of skill-training apps in the Android world. Apps like Memrise and Yousician can give you new skills, but there are also those that expand your knowledge and even games that train your brain.

Thanks to the internet and app developers, you don't need to pay tuition to learn valuable skills.

Do you use any apps to teach yourself new things? Let us know in the comments below.

Image Credit: Marta Design via Shutterstock.com