docs: update installation guide

docs/en/latest/building-apisix.md

@@ -45,16 +45,10 @@ To build and package APISIX for a specific platform, see [apisix-build-tools](ht
 
 ## Building APISIX from source
 
-First of all, we need to specify the version `APISIX_VERSION` to be installed:
-
-```shell
-APISIX_VERSION='3.9.0'
-```
-
 Then, you can run the following command to clone the APISIX source code from Github:
 
 ```shell
-git clone --depth 1 --branch ${APISIX_VERSION} https://github.com/apache/apisix.git apisix-${APISIX_VERSION}
+git clone --depth 1 --branch master https://github.com/apache/apisix.git
 ```
 
 Alternatively, you can also download the source package from the [Downloads](https://apisix.apache.org/downloads/) page. Note that source packages here are not distributed with test cases.

docs/en/latest/installation-guide.md

@@ -32,6 +32,42 @@ This guide walks you through how you can install and run Apache APISIX in your e
 
 Refer to the [Getting Started](./getting-started/README.md) guide for a quick walk-through on running Apache APISIX.
 
+## Installing etcd
+
+APISIX uses [etcd](https://github.com/etcd-io/etcd) to save and synchronize configuration. Before installing APISIX, you need to install etcd on your machine.
+
+It would be installed automatically if you choose the Docker or Helm install method while installing APISIX. If you choose a different method or you need to install it manually, follow the steps shown below:
+
+<Tabs
+  groupId="os"
+  defaultValue="linux"
+  values={[
+    {label: 'Linux', value: 'linux'},
+    {label: 'macOS', value: 'mac'},
+  ]}>
+<TabItem value="linux">
+
+```shell
+ETCD_VERSION='3.5.4'
+wget https://github.com/etcd-io/etcd/releases/download/v${ETCD_VERSION}/etcd-v${ETCD_VERSION}-linux-amd64.tar.gz
+tar -xvf etcd-v${ETCD_VERSION}-linux-amd64.tar.gz && \
+  cd etcd-v${ETCD_VERSION}-linux-amd64 && \
+  sudo cp -a etcd etcdctl /usr/bin/
+nohup etcd >/tmp/etcd.log 2>&1 &
+```
+
+</TabItem>
+
+<TabItem value="mac">
+
+```shell
+brew install etcd
+brew services start etcd
+```
+
+</TabItem>
+</Tabs>
+
 ## Installing APISIX
 
 APISIX can be installed by the different methods listed below:
@@ -222,42 +258,6 @@ If you want to build APISIX from source, please refer to [Building APISIX from s
 </TabItem>
 </Tabs>
 
-## Installing etcd
-
-APISIX uses [etcd](https://github.com/etcd-io/etcd) to save and synchronize configuration. Before installing APISIX, you need to install etcd on your machine.
-
-It would be installed automatically if you choose the Docker or Helm install method while installing APISIX. If you choose a different method or you need to install it manually, follow the steps shown below:
-
-<Tabs
-  groupId="os"
-  defaultValue="linux"
-  values={[
-    {label: 'Linux', value: 'linux'},
-    {label: 'macOS', value: 'mac'},
-  ]}>
-<TabItem value="linux">
-
-```shell
-ETCD_VERSION='3.5.4'
-wget https://github.com/etcd-io/etcd/releases/download/v${ETCD_VERSION}/etcd-v${ETCD_VERSION}-linux-amd64.tar.gz
-tar -xvf etcd-v${ETCD_VERSION}-linux-amd64.tar.gz && \
-  cd etcd-v${ETCD_VERSION}-linux-amd64 && \
-  sudo cp -a etcd etcdctl /usr/bin/
-nohup etcd >/tmp/etcd.log 2>&1 &
-```
-
-</TabItem>
-
-<TabItem value="mac">
-
-```shell
-brew install etcd
-brew services start etcd
-```
-
-</TabItem>
-</Tabs>
-
 ## Next steps
 
 ### Configuring APISIX
@@ -271,9 +271,13 @@ You can configure your APISIX deployment in two ways:
    apisix start -c <path to config file>
    ```
 
-APISIX will use the configurations added in this configuration file and will fall back to the default configuration if anything is not configured.
+APISIX will use the configurations added in this configuration file and will fall back to the default configuration if anything is not configured. Generally, APISIX gets installed at `/usr/local/apisix/` directory, so your configuration file will be present at `/usr/local/apisix/conf/` path.
+
+If you are unable to start APISIX and observe `Bind address already in use` in logs, it means the ports APISIX wants to use are already occupied by other running processes. Upon reviewing the use of these processes, you may decide to kill these processes or configure APISIX to use other non-conflicting ports.
+
+Other way is to configure the default listening port to other available port on your local machine.
 
-For example, to configure the default listening port to be `8000` without changing other configurations, your configuration file could look like this:
+In order to configure the default listening port to be `8000` without changing other configurations, your configuration file should look like this:
 
 ```yaml title="conf/config.yaml"
 apisix: