Docker installation and Version questions

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so what’s the difference between fenics-dolfin2019.2.0 and fenics0.9.0? And I didn’t see the docker which contains fenics0.9.0, does it exit???

FEniCS v0.9.0, ie. DOLFINx 0.9.0 is the latest stable release of the FEniCS project.
See for instance: The new DOLFINx solver is now recommended over DOLFIN

and Download | FEniCS Project
for installation instructions.

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or, whether there is a detailed document that demonstrates the difference between different versions?

In general, most features from legacy fenics exist in DOLFINx. However, DOLFINx is way faster, and also supports a lot of features not present in legacy fenics, such as:

• arbitrary order quadrilateral and hexahedral meshes
• Evaluation of ufl expressions at any point
• Proper parallel support for multiphysics
  and the list goes on.
  For even more details, you can also have a look at DOLFINx: The next generation FEniCS problem solving environment
  and the tutorials at:
  The FEniCSx tutorial — FEniCSx tutorial
  FEniCS workshop — FEniCS Workshop
  as well as the demos:

Demos — DOLFINx 0.9.0 documentation