Move Catalog to new computer

So it's really easy? Even if the driver letter changed I can tell LR, look there they are now, I do not have to linke each photo or folder manually? My catalog is linked to photos on 2 drives and multiple folders, one drive letter will change, but other then that the folder structure will remain.

By @Wurstkrapfen

You have to re-link the "parent" folder and this causes all subfolders and photos underneath the "parent" folder to be re-linked. You do not have to perform any operations folder by folder nor photo by photo. See Figure 4 here. https://www.computer-darkroom.com/lr2_find_folder/find-folder.htm 

Or force the drive letters to match, and then you don't even have to that.

This article definitely helps me a lot, but I still have some questions as I have a 2009 MacBook Pro and am waiting for my new iMac to come.

I want to be sure that I bring everything over without any error. I've just begun to get into digital photography, so in the grand scheme of things, I don't have that much data compared to a lot of you on here. However, I still have the same valid concerns.

Initially when I began using Lr, I was using Lr CC/mobile only. I didn't subscribe to/begin using Classic for about a few weeks after when I realized it has so much more to offer. As a result, it seems like I have photo files in more than one directory path now. The majority of my raw files are easy to find. However, I needed to dive deep into the package contents and subfolders to find what appears to be the files that originally stem from Lr CC/mobile - these are also how my 'albums' started and what Lr Classic sees as 'imported from Mobile' (I think - I'm not writing this on my personal computer as I'm at work right now, so I can't confirm).

Again, obviously I want to bring over everything. Note: there's also a difference in my Lr Classic between total photos and number synced. It's weird. Why might that be?

Any feedback would be appreciated. Thanks in advance.