Anyone with an interest in computers, technology, IT, an understanding of how hardware and software works, and most importantly, a desire to develop in this industry, can become a system administrator.

To master the profession and work successfully in it, you need to have certain personal qualities and skills:

Technical mindset, developed logical thinking, the ability to explain complex things in simple words.
Responsibility, discipline, multitasking without loss of quality.
Stress resistance, patience, composure, readiness for force majeure and non-standard situations.
Ability to properly distribute tasks during the working day, knowledge of techniques.
Developed communication skills, as you often have to communicate with colleagues, management, clients, etc.

How to learn system administration from scratch
If you want to learn system administration from scratch, you can choose one of the variants:

Study on your own, such as taking apart computers, reading e-books, watching Youtube videos.
Receive education in an educational institution – technical school, college, or institute.
Study remotely in your spare time – on a course for novice sysadmins at an online school.

You can learn on your own if you have at least a general idea about the structure of the PC, networks, the Internet, and information technology.

System administration is not an area that you can quickly learn on your own. You will have a lot of difficulties in the process of self-training:

Too much information that you will have to understand on your own – operating systems, networking and network protocols, basic , data storage and transfer, etc.
There is no clear understanding of what exactly needs to be studied. A sysadmin is a multidisciplinary specialist with knowledge in different areas.
Weak practical skills, lack of diploma and experience in real projects – all this will cause difficulties in employment.

In high school or college
Studying at a secondary or higher educational institution is an opportunity to learn a profession from scratch, learn different IT technologies and get a state diploma. Specialties related to system administration are available in many technical universities.

Distance learning – you do not need to go anywhere, you can study at home.
Free schedule – you can watch webinars online according to the schedule or in the record.
The curriculum contains only the necessary information – relevant and reliable information, without water and unnecessary theory.
A lot of practice, homework with checking and detailed comments from the teacher after each lesson.
Opportunity to communicate with industry experts – heads of IT-companies, and programmers.
Help with job search and free career advice.