Adobe FrameMaker (2019 release) is a complete solution for authoring and publishing technical content. So we need to use the seperate tool for Frame maker Author and Frame maker Publishing server? or Fm2019 is enough ?
FrameMaker Publishing Server is only needed, when you want to publish something automatically without user intervention.
Otherwise (for 99 % of the users) the regular FrameMaker version is sufficient. You can also publish to any of the advertised formats (PDF, HTML5, etc.). You have to publish one document after the other.
If you do not know exactly what FrameMaker does, then download the trial version and test it.
When you need more help, then contact someone from Adobe.