Here you will find the compiled list of tutorials available from my youtube channel.
Forth is an easy language, however, the old standard Forth is not what am aiming for with PC32. You can get a better idea of the essence of the language and my mental image by reading ULTRATECHNOLOGY by the late Jeff Fox, it's an invaluable resource for modern Forth programming and my main inspiration when coming up with PC32.
Aside from that there are also the books by the late Dr. Chen Hanson Ting with a repository found on GITHUB specially Footsteps in an empty valley and the EP32 book (called 'sutra.pdf' in the archive link) have been a must re-read for me over the years.
And of course, the fireside chats by Forth's inventor himself Mr Charles(Chuck) Moore, watch them all and then watch them again.