Union Said:
"Best way to save some (not all) data from old mac to hard drive, to access from new Mac.: I'm not selling it, thanks though. It's classified as 'late 2011' so 13 years old. So old the operating system and apps haven't been able to be updated for years. It's been good though!”
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You are welcome.
Based on personal experience….
Consider Recycling this:
I have a 2018 MacBook Pro, and I plan keep it bit, so that I can run Intel-Based software and older Windows Virtual Machines. I got rid of my 2010 MacBook Pro in 2017. Because it was so bulky an heavy. Rather than selling it, I recycled it at a local retailer. So, consider recycling it, if you ever have want to rid of it.
Consider AppleCare:
My 2017 MacBook Pro wend dead 11 times due to connection issues between the screen and the LogicBoard. Because I had AppleCare, Apple gave me a free $2,500 upgrade for no more than the price of the AppleCare coverage I purchase with it. I had to send it in 11 times via mail for it to be worked on. And being so patient of a customer, that is was I was granted the free upgrade. Refer to this Link: AppleCare Products - Mac - Apple