Education:
Computers allow users to find information on a vast range of subjects. This information will support student learning and help complete research on the topic. It also helps educators find resources for students to use.
Medicine:
Technology has advanced medical devices, and computers have helped digitize medical information accessible to doctors, nurses, and medical students.
Chemistry:
Scientists can collaborate and share their research with other scientists and experts around the world. You can also save the data on your computer and analyze it.
Entertainment:
Most people use computers for some form of entertainment. We can watch movies and TV shows, play games, listen to music, and talk to friends and family on our computers.
These are just a few examples of how we use computers today and how they have helped and improved our lives. However, it's important to be aware of how to use your computer, especially the Internet, safely. 

When would you use a desktop vs a portable PC?

Stationary or desktop computers are usually very fast and powerful. They also typically have higher performance and better features than portable PCs.

Additionally, desktops typically cost less and are cheaper to upgrade.

Users may prefer desktop computers due to their relative flexibility and versatility. This means it can be customized to suit individual needs and preferences.

Desktops are primarily used in enterprise computing and can be used for any kind of work. It is the perfect computer for working from home or the office, as it cannot be easily moved.

Desktops are popular not only for gaming but also for using graphic design and video editing software. This is because it has more processing power and features that deliver higher-quality graphics. A separate monitor means you have more screen space to work with.

Portable PCs and laptops, on the other hand, are the computers of choice for users who often work on the go or who are digital nomads. Useful if you travel to work or want to work in a coffee shop all day.

Laptops and other portable PCs are also suitable for students who can carry work from one class to another.

Laptops tend to cost more, both when you first buy them and when you upgrade. It also makes customization a little more difficult. But their main selling point is definitely portability. You can do the same things on your laptop as you do on your desktop computer. For example, editing documents and spreadsheets, playing games, editing videos, creating attractive graphics, and using various software. Note that its performance is significantly lower than that of desktop computers. 

More info: What is a Computer