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system vs application logs, production logs

I heard like
>> system logs contains  memory , jvm crash, restart etc system or computer related information
>>application logs has information about the application we developed. To see any application related errors go into the application logs

What are the best tipes, practices in checking and viewing, understanding production logs. what are the best tools to view production logs real time.How to rread logs from top to bottom or bottom to top.  any resources, links, books, ideas highly appreciated. Thanks in advance
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please advise


still not able to see any link on reading logs from bottom up or up to bottom