[Q] new to samsung. questions about S4 stuff

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http://forum.xda-developers.com – alright get ready for all the questions!!! lol so i came from my HTC EVO OG. rooting over there required unlocked bootloader and was wondering if thats the case or whats different about samsung? i also saw that there is twrp and cwm recoveries for the s4 right now, which is best? im assuming there are no awesome roms out yet because the phones brand new so ill check back on that later :p i keep seeing talk about odin and hiemdall too, what are they? a few other random questions too. im thinking about getting the s-view cover but i also want the wireless charging back. think i could someh (HowTos)