These days, you only need to use 3 of those operators: := for assignment, += for adding one item, and ++= for adding multiple. := is a bit weird since you can't override `=`, but the other two are exactly the same as you'd use with the standard collections library.
It's not only about the operators. The whole tools is not really straightforward. A great part of the time I just copy some magical strings into the build.sbt and sometimes it actually works. I tried learning it with understanding, believe me.
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