add some more Q&A to the FAQ

_overviews/FAQ/index.md

@@ -24,16 +24,6 @@ over again in Scala chat rooms and forums.
 
 see our [Community page](https://scala-lang.org/community/)
 
-### Should I learn Scala 2, or Scala 3?
-
-The default choice remains Scala 2 for now.  Most Scala jobs are Scala
-2 jobs; most Scala books and online learning materials cover Scala 2;
-tooling and library support is strongest in Scala 2; and so on.
-
-Scala 3.0 is planned for release in early 2021, and a number of
-Scala 3 books will come out in 2021 as well.  In time, there will
-be more and more Scala 3 jobs as well.
-
 ### What's a good book about Scala?
 
 Our [Books page](https://docs.scala-lang.org/books.html) lists a few
@@ -48,6 +38,52 @@ ask for book recommendations, but note that you'll get more helpful
 answers if you provide some information about your background and your
 reasons for wanting to learn Scala.
 
+### Should I learn Scala 2, or Scala 3?
+
+The default choice remains Scala 2 for now.  Most Scala jobs are Scala
+2 jobs; most Scala books and online learning materials cover Scala 2;
+tooling and library support is strongest in Scala 2; and so on.
+
+Scala 3.0.0 is planned for release in 2021, and a number of
+Scala 3 books will come out in 2021 as well.  In time, there will
+be more and more Scala 3 jobs as well.
+
+### When is Scala 3 coming out?
+
+In 2021.  Watch the [Scala blog](https://www.scala-lang.org/blog/)
+for announcements.  For a more detailed view of how work is progressing,
+see the [Dotty milestones](https://github.com/lampepfl/dotty/milestones).
+
+### Where are Scala jobs advertised?
+
+This is addressed on our [Community page](https://scala-lang.org/community/#scala-jobs).
+
+In short, the only officially sanctioned place is the [scala/job-board
+room on Gitter](https://gitter.im/scala/job-board).
+
+### Can I use the Scala logo?
+
+See [scala/scala-lang#1040](https://github.com/scala/scala-lang/issues/1040).
+
+## Technical questions
+
+### What compiler flags are recommended?
+
+The list of available options is
+[here](https://docs.scala-lang.org/overviews/compiler-options/index.html).
+
+What flags people choose varies widely from shop to shop and from
+individual to individual.  `-Xlint` is valuable to enable.  Some brave
+people enable `-Werror` (formerly `-Xfatal-warnings`) to make warnings
+fatal.
+
+[sbt-tpolecat](https://github.com/DavidGregory084/sbt-tpolecat) is an
+opinionated sbt plugin that sets many options automatically, depending
+on Scala version; you can see
+[here](https://github.com/DavidGregory084/sbt-tpolecat/blob/master/src/main/scala/io/github/davidgregory084/TpolecatPlugin.scala)
+what it sets.  Some of the choices it makes are oriented towards
+pure-functional programmers.
+
 ### How do I find what some symbol means or does?
 
 A [Stack Overflow answer](https://stackoverflow.com/a/7890032) lays
@@ -63,7 +99,14 @@ You can search for symbols on Google.  For example, if you want to
 know what `<:<` means, searching for `scala <:<` works fine.  If you
 get poor results, try surrounding the symbol with double quotes.
 
-## Specific technical questions
+### I want Scala 2.13 (or some other version); why does sbt say it's using Scala 2.12?
+
+sbt 1.x always uses Scala 2.12 to compile build definitions.
+Your sbt 1.x build definition is always a Scala 2.12 program.
+
+Regardless, in your `build.sbt` you can set `scalaVersion` to anything
+you want and your actual program code will be compiled with that
+version.
 
 ### Why is my (abstract or overridden) `val` null?