Training from the Czech domain registry, CZ.NIC
I completed my first and definitely not last course from the CZ.NIC Academy catalogue — this one covered the implementation of the IPv6 protocol. I already have some experience with it, but a practical perspective is always useful. We worked through several exercises, understood how addresses are formed, and looked at the advantages and disadvantages of different deployment approaches. Overall I rate the course very positively.
P.S. That same evening I was troubleshooting IPv6 access to my own website — and managed to resolve it successfully.