Welsh Resources
Classes:
SaySomethingInWelsh (North and South)
Learn Welsh (classes, digital resources, North and South)
Coursebooks for Learn Welsh courses
Listening:
BBC Radio Cymru
Podcasts on many topics curated for Welsh learners
Reading:
Parallel.cymru (magazine in parallel Welsh and English)
Back issues of Cylchgrawn Hwyl yr Haf (Summer Fun Magazine)
Misc:
Welsh dictionaries, corpora, field-specific terminology, and resources for parents and schools