I'm not the most experienced person in the area but I've been working on it for a few years, here are my thoughts.
It is difficult to tell someone who is starting to study what to study, because each company uses the technologies that they think is most appropriate and the aspiring professional can have an idea of where they want to work and end up working in another one due to an opportunity or need. Of course, you shouldn't go out looking to learn any and all technology or even try to learn something just because it's in the hype.
From what I've seen from comments from guys with more experience or even on the internet is that the base is the big difference and really if you stop to think about it, with a very solid base you will be at least 50% of the way in learning a technology . So what's the basis? Let's go to it and with some tips that are basically books and certifications already "consecrated".
1. Computer Networks
1.1 - Books
1.1.1 - Computer Networks - Tanenbaum
1.1.2 - Computer Networks and the internet - Kurose
1.1.3 - Data Communication and Computer Networks - Forouzan
1.2 - Certifications
1.2.1 - CCNA/CCNP/CCIE - Routing and Switching
1.2.2 - Comptia Network +
2. Operating Systems
2.1 - Books
2.1.1 - Modern Operating Systems - Tanenbaum
2.2 - Certifications
2.2.1 - MCSA 70-740, 70-741, 70-742, 70-743 (I don't know if they are still valid but they were until recently)
2.2.2 - LPIC-1, LPIC-2, LPIC-3
2.2.3 - VCP, VCAP, VCDX
3. Information Security
3.1 - Books
3.1.1 - Computer Security - Stallings
3.1.2 - Books on certifications (below)
3.2 - Certifications
3.2.1 - CISSP
3.2.2 - Security +
3.2.3 - CCNA - Security
3.2.4 - OSCP/OSCE
3.2.5 - CEH
4. Databases
4.1 - Books
4.1.1 - Database Systems - Navathe
4.1.2 - Book - Codd
4.2 - Certifications
4.2.1 - I don't know for sure the certifications but you can search for the market leading databases. Oracle, IBM, Microsoft, PostgreSQL, MySQL and others who must have certifications for their products
5. Computer Architecture
5.1 - Books
5.1.1 - Computer Architecture and Organization - Stallings
5.1.2 - Computer Architecture - Patterson
5.2 - Certifications
5.2.1 - I believe one is the Comptia A+
6. Programming
6.1 - Books
6.1.2 - The literature on programming logic and algorithms is vast, I don't know if there is a consecrated author, but it is basically programming logic and algorithms
6.1.3 - It is also worth looking at the fundamentals of object-oriented programming
6.2 - Certifications
6.2.1 - I know there is a Java certification from Oracle
Anyway, this would be a basis for a professional infrastructure analyst, but it must be considered that there is a lot of overlap in areas such as programming, networks and operating systems. Hardly anyone will become an expert in all these areas but a reasonable knowledge is likely to be necessary and there is yet another area that is also being demanded of professionals now that is the cloud, then they come in a footprint just for an architect. the part of networks, operating systems, computer architecture, security in addition to the part of DevOps and also the Cloud Native applications. This area also has its books and certifications from the main manufacturers such as AWS, Azure, GCP and Oracle in addition to others, each manufacturer has certifications focused on architecture, development, operations. There are still hehe certifications for products like Kubernetes and I didn't mention firewalls, storage, wireless, IoT, backup either. Anyway, it's a multitude of products, books and certifications, you have to be careful not to go crazy =)
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