diff --git a/docs/installation.rst b/docs/installation.rst
index dc34638..5d28163 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -6,7 +6,7 @@ Installations
 
 Upon installing Docker or Apptainer on your machine,
 you will be able to use any containerized software listed 
-in the MolSSI Container Hub. Simply, follow the instructions
+in the **MolSSI Container Hub**. Simply, follow the instructions
 below and navigate to the :ref:`quick_start` page for further
 instructions on how to unleash the power of containerized
 software in your research and hopefully, boost your productivity.
diff --git a/docs/quick_start.rst b/docs/quick_start.rst
index bacde70..9c18e79 100644
--- a/docs/quick_start.rst
+++ b/docs/quick_start.rst
@@ -10,13 +10,12 @@ Quick Start
 
 **This page is under development**
 
-Using **MolSSI-AI Container Hub** is very simple if you are familiar with 
-`dockerhub <https://hub.docker.com/>`_ know how to use 
-`Docker <https://www.docker.com/>`_.
-
 .. Tip::
-   
-   Check the Docker's `documentation <https://docs.docker.com/>`_
+   For using **MolSSI-AI Container Hub**, a basic familiarity 
+   with Docker or Apptainer will be helpful but not necessary.
+   Make sure you take a glance at the :ref:`installation` page.
+
+   Check the Docker `documentation <https://docs.docker.com/>`_
    if you are unfamiliar with the Docker. The documentation offers
    a nice `tutorial <https://docs.docker.com/get-started/>`_ series
    to get you up and running, quickly.
@@ -24,5 +23,92 @@ Using **MolSSI-AI Container Hub** is very simple if you are familiar with
 Structure of MolSSI-AI Container Hub
 ====================================
 
-Provide a tree structure and explain what's in one folder, scripts and
-Dockerfile.
\ No newline at end of file
+The **Molssi Container Hub** provides three ingredients for each
+containerized software:
+
+* Image recipie
+* Container repository
+* Image catalog
+
+Let's focus on a specific software, say, MOPAC to see how the aforementioned
+ingredients come into play.
+
+In order to be able to use MOPAC, one normally needs to install it on the host
+machine first. This can be done either by building MOPAC from the 
+`source repository <https://github.com/openmopac/mopac>`_ or via graphical installer.
+One can also use Conda or Fedora package managers or download MOPAC from Google Play Store.
+Each route has its complexity and might be suitable for one operating system or another.
+
+One of the benefits of using Docker or Apptainer is that once you have either of them
+on your machine, you are set to use any containerized software including those listed
+in the **MolSSI Container Hub** without having to install anything else or try figuring
+out and meeting their dependencies.
+
+
+Image Recipes
+-------------
+
+For each containerized software, including MOPAC, we provide an 
+`image recipe <https://github.com/MolSSI/molssi-hub/blob/main/molssi_hub/compchem/mopac220-mamba141/Dockerfile>`_
+which tells you how we build the software inside an isolated environment (container).
+For simplicity, think of containers as an entity similar to a portable virtualenv or Conda 
+environment and the image recipe similar to an environment YAML file. Since the software is isolated 
+in its own filesystem, you can run it on a variety of operating systems in a reproducible manner.
+
+.. tip::
+
+   Once you are comfortable with Docker, you can write your own image recipes or fine-tune those
+   available from the **MolSSI Container Hub** towards your needs.
+
+
+Container Repositories
+----------------------
+
+Container repository is a place we build and then *register* our ready-to-use containers on.
+Container repository is an entity similar to `PyPI <https://pypi.org/>`_ which is a 
+repository for software written in Python: you can search through the repository, find your
+software and fetch it into your system to use using a command such as `pip install ...`. 
+There can be a variety of container repositories within a container registry. 
+`Docker Hub <https://hub.docker.com/>`_ is an example of a container registry and the 
+one we use it to publish our containerized software. You can use the following command
+to fetch the latest version of MOPAC image into your machine
+
+.. code-block:: bash
+
+   docker pull molssi/mopac220-mamba141:latest
+
+Once you have downloaded the image on your machine, you can use it via the following command
+
+.. code-block:: bash
+
+   docker run --rm -it molssi/mopac220-mamba141:latest /bin/bash
+
+which creates a temporary Docker container and allows you to get access to it through an interactive
+PuTTY bash session. Think of this step as running a ``conda activate <env>`` command. You can now
+work with your terminal interactively as if you have MOPAC installed on your system. Just run a
+``mopac --version`` command to test it.
+
+.. note::
+
+   The ``docker run`` command will use your existing docker image to create the temporary environment
+   for you. If the image does not exist on your machine, the ``docker run`` command will fetch the 
+   image for you from the repository before running the container. Once you exit from the container
+   environment, it is automatically destroyed like it never existed! 
+
+.. tip::
+
+   If you want to retain your environment, you can remove the ``--rm`` flag from your run command.
+
+Image Catalogs
+--------------
+
+Image catalogs are auto-generated documentation pages for all information you need about a containerized
+software: the developers, the source repository, the links to the container regiestry, image recipes etc.
+As an example, you can see in the 
+`MOPAC catalog <https://molssi.github.io/molssi-hub/compchem/mopac220-mamba141.html>`_ that we have also 
+included the Docker commands that you will need to pull/run the containers from their repository.
+
+Thus, when you want to use any containerized software listed on the **MolSSI Container Hub**, the fastest 
+way might be to just go to the `documentation page <https://molssi.github.io/molssi-hub>`_, search for 
+your favorite containerized software, nativate to its catalog page and copy-paste the Docker command in 
+a terminal to use the software.
\ No newline at end of file
diff --git a/molssi_hub/compchem/psi4v180-mamba141/Dockerfile b/molssi_hub/compchem/psi4v180-mamba141/Dockerfile
index 62c91f5..a2e46e8 100644
--- a/molssi_hub/compchem/psi4v180-mamba141/Dockerfile
+++ b/molssi_hub/compchem/psi4v180-mamba141/Dockerfile
@@ -4,7 +4,7 @@ LABEL maintainer="Mohammad Mostafanejad, \
                   Molecular Sciences Software Institute"
 
 RUN mamba install psi4 \ 
-    python=3.8 \
+    "pydantic<2.0" \
     -c conda-forge/label/libint_dev \
     -c conda-forge -yq \
  && mamba clean -afy \