How to Learn about linux-server and O & M

How can I learn about linux-Server & amp; O & M-general Linux technology-Linux technology and application information? The following is a detailed description. I am currently working on server environment construction, testing environment debugging and O & M, but I find that my capabilities are lacking.
I have read the Private food and other materials of laruence, but I found it difficult to use it. I didn't really learn it well. I just read the first part of laruence, but I haven't read it yet.
I need to handle the problem as soon as possible, but I still encounter errors when installing red-flag Linux. I use virtual machines.
I want to learn about samba, ftp, and other configurations and partitions... request recommendation materials, recommended version. I am engaged in financial systems. In my initial studies, should I first learn red-flag Linux, redhat, or aix?
1. Please recommend a system. You 'd better give me the image address and I will download it.
2. How should I learn about linux? Start from scratch, such as laruence, step by step or follow the project to learn slowly? I feel dizzy with various configurations
3. What are the prospects for server building and O & M?
I am afraid I can't take linux for four cups. Do I have to attend the training?
5. Please recommend one or more books or video tutorials.
6. Can I leave a partition teacher for me? I just want to list my linux partitions. Are there only three partitions required? //,/Boot, swap
7. If you need any other guidance or lessons, please do not give me any further advice!

Thank you very much! A hard-earned beginner!