I understand they run a different system and Windows run a NTFS storage while Apple runs a Journal storage.
This has no bearing on anything transferred over a network.
What if I do editing for photoshop like pictures on my Apple and then I need to transfer it over to my PC to print it out?
A TIF is a TIF, a JPG a JPG, a PSD a PSD, a GIF a GIF, a PNG a PNG and any other image format (with some limited exceptions). It doesn't matter if it's on a Mac or a PC. Photoshop understands all of those image formats.
I just don't understand what if I need to put a USB into my Mac then transfer it over to my PC if it's not compatible.
Who said there was no compatibility? Macs have been able to read PC disks since the early 90s, if not before.
But somehow it would be compatible if uploaded online through email but would be a hassle to affect my bandwidth.
Why are you making this more difficult for yourself than it has to be?
I don't have a Mac but I am planning to grab one but main concern is the compatibility between each other. Can someone tell me how flexible to share the files between each other? Thanks.
It's not about Mac/PC compatibility. On a network both Macs and PCs use industry standard protocols such as CIFS or SMB to communicate. Compatibility comes in the form of the programs you run on your computers. Manufacturers and developers work hard so that there is no cross platform problems. Photoshop on PC will open image files made on a Mac and Photoshop on Mac will open image files made on a PC. It's really not as big a deal as you are making it out to be.
Hook the Mac up to your network. Turn on file sharing on your Mac, turn on file sharing on the PC. Connect from whatever computer you want and transfer. Simple.
Or just transfer via USB as has already been mentioned. Macs will read FAT, FAT32 and NTFS disks. To write to a directly connected NTFS disk install NTFS-3G on the Mac. If you want, you can also install MacDrive on the PC to read Mac disks directly.