Thanks for your time and advice.

1- Sometimes randomly when I mirror an object and if I move the original object, then the mirrored object also starts moving. Is it HISTORY related? I had/have history disbaled but it still moves? (sorry not happenign rigth now so no example file to provide)

2- I have to make a tunnel type of thing with rectangular blocks. Instead of creating new block each time, is there an instancing option that I could use? Shoudl I be looking at ARRAY?

3- If I have select/highlight object A and then I control drag to create object B. I would preffer if the new object B is highilghted instead of object A still being in selection mode. I guess no simple option to alter it?

4- Is there any way to save my keyboard shortcuts? OR which file stores all the shortcuts? I had to reinstall my OS in emergency and lost all my main shortcuts so I want to be prepared for the future.