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diff --git a/docs/linux/environment-variables.md b/docs/linux/environment-variables.md
diff --git a/docs/linux/setup/environment-variables.md b/docs/linux/setup/environment-variables.md
@@ -0,0 +1,65 @@
+---
+title: Environment variables
+tags:
+  - windows
+  - linux
+draft: true
+---
+
+## Linux
+
+[Arch Wiki: environment variables](https://wiki.archlinux.org/index.php/environment_variables)
+
+=== "System-wide"
+
+    - `/etc/profile` is sourced by all POSIX-compatible shells upon login.
+    - Files inside the `/etc/profile.d/` directory will also be sourced.
+
+=== "Bash"
+
+    - `~/.profile` or `~/.bash_profile` for login bash instances.
+    - `~/.bashrc` for every interactive bash instance.
+
+=== "Zsh"
+
+    - `~/.zshenv` for environment variables in all zsh instances.
+    - `~/.zprofile` for every login zsh instance.
+    - `~/.zshrc` for every interactive zsh instance.
+
+    !!! note
+        zsh [does not source](https://superuser.com/questions/187639/zsh-not-hitting-profile) `~/.profile` by default. You can add this line to `~/.zprofile` or `~/.zshenv` to let zsh login shells read `~/.profile`
+
+    ```zsh title="~/.zshenv"
+    test -r ${HOME}/.profile && emulate sh -c 'source ${HOME}/.profile'
+    ```
+
+=== "X windows"
+
+    - `~/.xinitrc` is sourced by `startx`.
+    - `~/.xprofile` is sourced by display managers (e.g. GDM, SDDM)
+
+=== "Systemd"
+
+    - `~/.config/environment.d/*.conf`: sourced by `systemd`. Also used in WayLand sessions where `xinitrc` and `xprofile` is not available.
+
+## Windows
+
+[Environment variables in Powershell](https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_environment_variables?view=powershell-7.3)
+
+### Shell variables
+
+Variables created by `set` are bound to the current session and not persistent.
+
+```powershell
+$Env:FOO = "example"
+$Env:FOO
+```
+
+### Persistent variables
+
+- GUI: Windows Settings -> Advanced system settings -> Set **Environment Variables**.
+- CLI: `SetEnvironmentVariable` function.
+
+```powershell
+[Environment]::SetEnvironmentVariable('Foo', 'Bar', 'Machine')
+```
diff --git a/docs/linux/fonts-setup.md → docs/linux/setup/fonts-setup.md b/docs/linux/fonts-setup.md → docs/linux/setup/fonts-setup.md
diff --git a/docs/linux/linux-local-time.md → docs/linux/setup/linux-local-time.md b/docs/linux/linux-local-time.md → docs/linux/setup/linux-local-time.md
diff --git a/docs/linux/swap-setup.md → docs/linux/setup/swap-setup.md b/docs/linux/swap-setup.md → docs/linux/setup/swap-setup.md
diff --git a/docs/linux/ubuntu-3rd-party.md → docs/linux/setup/ubuntu-3rd-party.md b/docs/linux/ubuntu-3rd-party.md → docs/linux/setup/ubuntu-3rd-party.md
diff --git a/docs/linux/ubuntu-postinstall.md → docs/linux/setup/ubuntu-postinstall.md b/docs/linux/ubuntu-postinstall.md → docs/linux/setup/ubuntu-postinstall.md
diff --git a/docs/linux/copy-file-over-ssh.md → docs/linux/tips/copy-file-over-ssh.md b/docs/linux/copy-file-over-ssh.md → docs/linux/tips/copy-file-over-ssh.md
@@ -8,20 +8,20 @@ tags:
 
 How to copy files through the secure shell (SSH).
 
-## scp command
+## Using scp command
 
-`scp` works similar to regular copy (`cp`) command.[^scp]
+`scp` works similar to the regular copy (`cp`) command.[^scp]
 
 [^scp]: https://kb.iu.edu/d/agye
 
 ```sh
 scp [options] username1@source_host:directory1/filename1 username2@destination_host:directory2/filename2
 ```
 
-## tar and pipe
+## Using tar and pipe
 
 ```sh
-tar cvf - $localdir | ssh someone@somemachine '(cd somewhere && tar xBf -)'
+tar cvf - $localdir | ssh someone@somemachine '(cd destdir && tar xBf -)'
 ```
 
 ## Secure FTP (SFTP)
@@ -32,15 +32,15 @@ And newer versions of `scp` also use `sftp` by default.[^scpandsftp]
 
 [^scpandsftp]: https://wiki.archlinux.org/title/SCP_and_SFTP
 
-## Mount as a disk using sshfs
+## Mount remote directory as a disk via sshfs
 
-[sshfs](https://github.com/libfuse/sshfs) could mount remote machine's directory as a local disk.
+https://github.com/libfuse/sshfs mounts a remote machine's directory as a local disk.
 
 ```sh
 sshfs [user@]hostname:[directory] mountpoint
 ```
 
-to unmount the directory
+To unmount the directory after file operations are done:
 
 ```sh
 fusermount -u mountpoint

diff --git a/docs/linux/copy-files-selectively.md → docs/linux/tips/copy-files-exclude.md b/docs/linux/copy-files-selectively.md → docs/linux/tips/copy-files-exclude.md
@@ -1,5 +1,5 @@
 ---
-title: Copy files selectively
+title: Copy a directory tree with exclusions
 draft: false
 tags:
   - linux
@@ -17,7 +17,7 @@ tar cf - $src | tar xvf - -C $dst
 
 [^1]: https://docstore.mik.ua/orelly/unix3/upt/ch10_13.htm
 
-A filter `.tarignore` excludes files/directories just like `.gitignore` does.[^2][^3]
+A filter file `.tarignore` excludes stuff similar to `.gitignore`.[^2][^3]
 
 ```sh
 tar -c -X .tarignore -f - srcfolder | tar xvf - -C dstfolder
@@ -39,12 +39,10 @@ The syntax is similar to `.gitignore`:
 Use `--exclude` flag in `rsync` to exclude certain folder(s). [^4]
 
 ```sh
-
 rsync -av --progress sourcefolder /destinationfolder --exclude thefoldertoexclude --exclude anotherfoldertoexclude
-
 ```
-  
-> [! warning]
+
+> [!warning]
 > The excluded directory paths are relative to the *sourcefolder*.
 
-[^4]: https://stackoverflow.com/questions/4585929/how-to-use-cp-command-to-exclude-a-specific-directory
+[^4]: https://stackoverflow.com/questions/4585929/how-to-use-cp-command-to-exclude-a-specific-directory
diff --git a/docs/linux/cpu-freq.md → docs/linux/tips/cpu-freq.md b/docs/linux/cpu-freq.md → docs/linux/tips/cpu-freq.md
@@ -8,27 +8,27 @@ tags:
 
 From the [Stackoverflow post](https://askubuntu.com/questions/1415288/how-to-install-cpupower-on-ubuntu-20-04-with-kernel-5-17)
 
-Query the CPU options
+Query CPU options
 
 ```bash
 grep . /sys/devices/system/cpu/cpu0/cpufreq/*
 ```
 
-Change the maximum CPU frequency
+Set the maximum CPU frequency
 
 ```bash
 echo 4400000 | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
 ```
 
 ## cpufrequtils
 
-You can install the tool `cpufrequtils`
+You can also install the tool `cpufrequtils`
 
 ```bash
 sudo apt install cpufrequtils
 ```
 
-Set maximum CPU frequency
+Set the maximum CPU frequency
 
 ```bash
 sudo cpufreq-set -u 4Ghz

diff --git a/docs/linux/passing-arguments-txt.md → docs/linux/tips/passing-arguments-txt.md b/docs/linux/passing-arguments-txt.md → docs/linux/tips/passing-arguments-txt.md
diff --git a/...linux/passing-multiple-lines-of-string.md → .../tips/passing-multiple-lines-of-string.md b/...linux/passing-multiple-lines-of-string.md → .../tips/passing-multiple-lines-of-string.md
diff --git a/.../linux/recover-nautilus-places-folders.md → ...x/tips/recover-nautilus-places-folders.md b/.../linux/recover-nautilus-places-folders.md → ...x/tips/recover-nautilus-places-folders.md
diff --git a/docs/linux/set-gpu-power-limit.md → docs/linux/tips/set-gpu-power-limit.md b/docs/linux/set-gpu-power-limit.md → docs/linux/tips/set-gpu-power-limit.md