diff --git a/how-to-configure-hardened-raspberry-pi/README.md b/how-to-configure-hardened-raspberry-pi/README.md
index 5db1e2b..24f97a3 100644
--- a/how-to-configure-hardened-raspberry-pi/README.md
+++ b/how-to-configure-hardened-raspberry-pi/README.md
@@ -313,7 +313,7 @@ apt update
 
 #### Install `iptables-persistent` and Vim
 
-When asked to save current IPv4 or IPv6 rules, answer `Yes`.
+When asked to save current IPv4 or IPv6 rules, answer “Yes”.
 
 ```shell
 apt install -y iptables-persistent vim
@@ -371,7 +371,7 @@ EOF
 sysctl -p
 ```
 
-### Step 28: configure iptables
+### Step 28: configure firewall
 
 ```shell
 iptables -N SSH_BRUTE_FORCE_MITIGATION
@@ -434,7 +434,7 @@ ip6tables -P INPUT DROP
 ip6tables -P OUTPUT DROP
 ```
 
-### Step 29: log out and log in to confirm iptables didn’t block SSH
+### Step 29: log out and log in to confirm firewall didn’t block SSH
 
 #### Log out
 
@@ -457,7 +457,7 @@ ssh pi@10.0.1.248 -i ~/.ssh/pi
 sudo su -
 ```
 
-### Step 31: make iptables rules persistent
+### Step 31: make firewall rules persistent
 
 ```shell
 iptables-save > /etc/iptables/rules.v4
diff --git a/how-to-configure-strongswan-client-on-headless-debian-based-linux-computer/README.md b/how-to-configure-strongswan-client-on-headless-debian-based-linux-computer/README.md
index 42181e5..3d54083 100644
--- a/how-to-configure-strongswan-client-on-headless-debian-based-linux-computer/README.md
+++ b/how-to-configure-strongswan-client-on-headless-debian-based-linux-computer/README.md
@@ -105,7 +105,7 @@ ssh pi@10.0.1.248 -i ~/.ssh/pi
 su -
 ```
 
-### Step 4: configure iptables
+### Step 4: configure firewall
 
 > Heads-up: input rules are likely already configured (run `iptables-save` and `ip6tables-save` to check).
 
@@ -125,7 +125,7 @@ ip6tables -A OUTPUT -p udp --dport 500 -m state --state NEW -j ACCEPT
 ip6tables -A OUTPUT -p udp --dport 4500 -m state --state NEW -j ACCEPT
 ```
 
-#### Make iptables rules persistent
+#### make firewall rules persistent
 
 ```shell
 iptables-save > /etc/iptables/rules.v4
diff --git a/how-to-self-host-hardened-strongswan-ikev2-ipsec-vpn-server-for-ios-and-macos/README.md b/how-to-self-host-hardened-strongswan-ikev2-ipsec-vpn-server-for-ios-and-macos/README.md
index e3fd90f..23787f8 100644
--- a/how-to-self-host-hardened-strongswan-ikev2-ipsec-vpn-server-for-ios-and-macos/README.md
+++ b/how-to-self-host-hardened-strongswan-ikev2-ipsec-vpn-server-for-ios-and-macos/README.md
@@ -249,13 +249,13 @@ $ source ~/.bashrc
 
 ### Step 17: install iptables-persistent
 
-When asked to save current IPv4 or IPv6 rules, answer `Yes`.
+When asked to save current IPv4 or IPv6 rules, answer “Yes”.
 
 ```shell
 apt install -y iptables-persistent
 ```
 
-### Step 18: configure iptables
+### Step 18: configure firewall
 
 ```shell
 iptables -N SSH_BRUTE_FORCE_MITIGATION
@@ -334,7 +334,7 @@ ip6tables -P INPUT DROP
 ip6tables -P OUTPUT DROP
 ```
 
-### Step 19: log out and log in to confirm iptables didn’t block SSH
+### Step 19: log out and log in to confirm firewall didn’t block SSH
 
 #### Log out
 
@@ -361,7 +361,7 @@ When asked, enter root password.
 su -
 ```
 
-### Step 20: make iptables rules persistent
+### Step 20: make firewall rules persistent
 
 ```shell
 iptables-save > /etc/iptables/rules.v4
diff --git a/how-to-use-trezor-wallet-on-tails/README.md b/how-to-use-trezor-wallet-on-tails/README.md
index ab11c79..0b7030d 100644
--- a/how-to-use-trezor-wallet-on-tails/README.md
+++ b/how-to-use-trezor-wallet-on-tails/README.md
@@ -102,7 +102,7 @@ Setting up trezor-bridge (2.0.30) ...
 Created symlink /etc/systemd/system/multi-user.target.wants/trezord.service → /usr/lib/systemd/system/trezord.service.
 ```
 
-### Step 9: configure iptables
+### Step 9: configure firewall
 
 ```console
 $ sudo iptables -I OUTPUT 3 -o lo -s 127.0.0.1/32 -d 127.0.0.1/32 -p tcp --dport 21325 --syn -m owner --uid-owner amnesia -m conntrack --ctstate NEW -j ACCEPT