It's difficult to tell the best field to focus on so that you might earn more money. Every field in computer science is useful and awesome. You just need to realize where your potential lies. You might decide to focus on web technologies, but you have a passion for machine learning. It’s a personal choice after you have gotten advice from various experienced experts.
Of course, everyone wants to get a good job immediately after they finish their studies. Others want to earn as freelancers from technology while schooling(which is possible). Here is simple advice for all your questions.
Web development
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Web development is very popular and has been there for a long time. Almost every business needs a website. Other minor companies have shifted to e-Commerce platforms to gain more traffic. Almost every manager will hire a web engineer to build and maintain their sites. What does this mean?, it's very easy to be absorbed by the industry when you have front-end or back-end web skills. Many startups focus on building responsive and productive web platforms. You might even start freelancing while at home.
App development
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Second, App development is another field that has many industries. Similar to web development, businesses and various organizations need to host their products on apps. It is said that most online traffic is accessed through mobile. People prefer looking for a product on a specific app than searching for websites. Okay, this is for a portion of people and not everyone. Therefore, if you want to be an app developer, opt for a flutter or react native because they can develop cross-platform applications. You just write single code for both Android and iOS phones.
Cybersecurity
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Cybersecurity is the most growing field in computer science. It is estimated that almost the rate of growth in the US is 4 times more than other careers. Everything is turning into technology and there is a need for the protection of data. Black hart hackers come up daily with malware, and large industries are calling upon white hat hackers to come and destroy. If you want, be good in backend languages like PHP, Python, C. Besides, you have to understand Linux commands and how networking occurs.
Bonus
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Yes, AI, Data Science, and Machine learning are growing too. But they're still coming up with a few large tech companies investing their dollars in research. These jobs pay a lot of money. When you finally get employed in a company like Google, Microsoft, etc., be sure to get a 6-figure salary. But their jobs are still very few. The number of vacancies depends on the country and how technology has grown there.
Getting a job from a local company is difficult.
Confidently, if you have time and enough money to sustain yourself as you dig deep in AI or data science, you will earn a lot.
The Bureau of statistics of US showed that AI jobs will double in the next five years. Machine learning engineers will be on demand shortly. But it requires time to grasp the data concepts.
The good thing about studying computer science or software engineering is that it's flexible. You can decide to shift from web development to app development within two months. But be proud as a computer science student, either online or in an institute.
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