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Im using the stock layouts that came with....

I have been working on this now for about a week!
I have deleted EVERYTHING and started over.... twice...  I am on my third try!
(first time it was because I trashed some of the files and it was easier to restart)

1)
I am finding myself going back and forth between the "default" and "bootstrap" layouts making the SAME changes to both and then all of a sudden the changes I have made are now undone....
Then in my web browser sometimes it will load the default page and sometimes the bootstrap.
Is there a way to force the use of bootstrap ONLY? So if you use a computer or a mobile it will work off the same page?
Or to just make changes to the Bootstrap layouts and have t make the same changes to the default files?

2)
Across the top of my dashboard and admin pages there is a bar accross the very top of the window.
The little bell comes on and there is a message pops up wanting to either sell me something, upgrade something(upgrade not update) or submit a review and rating. I have done a "rating" once but it keeps coming up over and over....
Is there a way to turn those notifications OFF?

1)
can you give me the path where the blocks and layout files are stored?
I am having trouble finding them.

Thanks