Alibaba is basically just wholesale aliexpress, most sellers have a minimum order quantity and have clear pricing scale depending on your order.

TCP/IP Illustrated, Vol. 1, it may be a little bit outdated, but the core concepts still stand.

You’re asking if you should use it, while my ISP was working on it in 2017 and then it all got canned when they got bought out :( .

Can confirm that HE course is good. They’ve even sent me a free t-shirt after I’ve completed it.

The smallest recommended IPv6 subnet is /64. The biggest issue you will encounter is that SLAAC will refuse to work on anything smaller, and it just so happens that Android still doesn’t support DHCPv6 and will be left without a valid address.

Keep in mind that a lot of your local marketplace sellers just order rebadged stuff from alibaba. I’ve found literally the same electronics i’ve bought locally on aliexpress for like half the price.