As I say:- the Internet. There are
many sites. Lots of
newsletters too (which I guess is what you're really talking about). You can even access them when you're away from work!
Here's another. And
this one, even. As I say, there's a load of this stuff out there. Plus a
zillion forums, tech and otherwise. You can arrange to receive a customised ("personalized") newsletter from many of them. Usually free of charge (and paid for, supposedly, by the advertising content). The only problem is finding the time to check it all out (but, there again, that's going to be
your job ... that is, to filter the wheat from the chaff)!
But, surely, all anyone needs is
this very forum?

PS: when you get around to sorting out those manuals, don't forget to list all details in a database (or, if you insist, Excel spreadsheet). Also, place all surpluses to one side, then let me know and I'll come and take them off your hands!