Did I do this right? LAN / WAN

Opening up any local network device to remote access presents potential security risks. There are several previous threads that discuss various security issues with the My Cloud.

What does “228 write and 379 read” mean? Is it in megabytes, megabits, kilobites, kilobits, etc.

There are a lot of factors that affect copy speeds to and from the My Cloud. Start by reading the following thread:

https://community.wd.com/t/before-you-pack-up-your-wd-and-return-it-lets-talk-about-copying-speeds/91887

Then understand you will almost never get the advertised top speed of your equipment. There will be bottlenecks with certain hardware that will reduce the network copying speed. If copying over WiFi expect eh speed to be generally lower than when copying over a Ethernet connection.