This YouTube channel is my go to place for any manual machining help. He goes by the name Tubalcain. He has great lathe and milling skills.
I also like open source machine tools. He finds older training videos and makes some fairly modern instruction videos about manual machining.
Our machinery is a Bridgeport Mill, small Grizzly mill and a Graziano lathe.
If you know of some other great youtube or website instructional places, let me know so I can share them.