few LUKS queries

hi,
i've recently decided to ditch 'luckyLUKS' gui, and get more up to speed on linux filesystem, and get more comfortable with the mounting/unmounting process... so, i recently encrypted one USB drive using LUKS, using a few walkthrough's online... 
> but i wonder if there are any clear, present tutorials walking through the process... as i'm now seeing the LUKS2 is used on a few other tutorials, so wanted to make sure i am approaching this task as best i can. 

basically. i'd love to encrypt a few small usb drives. then when comfortable with that, will move onto my 2 larger ssd and hdd drives (1tb and 1.5tb in size)... and maybe encrypt my linux home folder, if all goes well.. 
> i assume LUKS will be able to encrypt my large ext drives? 

> i wonder if there is a way to edit/change any of the folders i created when encrypting the usb drive? the device name, container as well as mount point? or are they set in stone? (not big deal, just thought to check)

> lastly, im curious as to the best file system to use for this process? been exploring a bit my options. im fine only using my ext drives on my linux, so i imagine exFAT or ext4 are recommended? will do one usb drive with FAT32 to be used on other computers. 

thanks so much. sorry about all the questions. just thought to put them all together. hope thats ok. 
phil




Sent with Proton Mail secure email.