Add dsk learning

[rbdr/txt] / learning.md

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+2024-02-09: Some disk images will be wrecked even if you restore their attributes (apparently DiskCopy 6.3 images).
 2024-01-24: When AppleTalk is enabled you can't use the printer port for a modem in a Macintosh SE/30. You need to disable it in Chooser first.
 2024-01-23: AWS Glue has some very inefficient ways of composing queries, so it's sometimes easier to embed the query itself. In postgres it doesn't let you but you can add sources for each table and then run the query. This seems to work a lot faster.
 2024-01-22: ssl_early_data on; can mess up your responses in safari if you set it in more than one place. What's worse, because of the caching it uses it can be annoying to revert.