style: Simplify and rewrite sections for improved clarity

Signed-off-by: redoomed1 <redoomed1@privacyguides.org>

docs/security-keys.md

@@ -19,7 +19,7 @@ A physical **security key** adds a very strong layer of protection to your onlin
   ![Security Key Series by Yubico](assets/img/security-keys/yubico-security-key.webp){ width="315" }
 </figure>
 
-The **Yubico Security Key** series is the most cost-effective hardware security key with FIDO Level 2 certification[^1]. It supports FIDO2/WebAuthn and FIDO U2F, and works out of the box with most services that support a security key as a second factor, as well as many password managers.
+The **Yubico Security Key** series is the most cost-effective hardware security key with FIDO Level 2 certification[^1]. It supports [FIDO2/WebAuthn and FIDO Universal 2nd Factor (U2F)](basics/multi-factor-authentication.md#fido-fast-identity-online), and works out of the box with most services that support a security key as a second factor, as well as many password managers.
 
 [:octicons-home-16: Homepage](https://yubico.com/products/security-key){ .md-button .md-button--primary }
 [:octicons-eye-16:](https://yubico.com/support/terms-conditions/privacy-notice){ .card-link title="Privacy Policy" }
@@ -54,7 +54,7 @@ The firmware of Yubico's Security Keys is not updatable. If you want features in
   ![YubiKeys](assets/img/security-keys/yubikey.png){ width="400" }
 </figure>
 
-The **YubiKey** series from Yubico are among the most popular security keys with FIDO Level 2 Certification[^1]. The **YubiKey 5 Series** has a wide range of features such as [Universal 2nd Factor (U2F)](https://en.wikipedia.org/wiki/Universal_2nd_Factor), [FIDO2 and WebAuthn](basics/multi-factor-authentication.md#fido-fast-identity-online), [Yubico OTP](basics/multi-factor-authentication.md#yubico-otp), [Personal Identity Verification (PIV)](https://developers.yubico.com/PIV), [OpenPGP](https://developers.yubico.com/PGP), and [TOTP and HOTP](https://developers.yubico.com/OATH) authentication.
+The **YubiKey** series from Yubico are among the most popular security keys with FIDO Level 2 Certification[^1]. The **YubiKey 5 Series** has a wide range of features such as [FIDO2/WebAuthn and FIDO Universal 2nd Factor (U2F)](basics/multi-factor-authentication.md#fido-fast-identity-online), [TOTP and HOTP](https://developers.yubico.com/OATH) authentication, [Personal Identity Verification (PIV)](https://developers.yubico.com/PIV), and [OpenPGP](https://developers.yubico.com/PGP).
 
 [:octicons-home-16: Homepage](https://yubico.com/products/yubikey-5-overview){ .md-button .md-button--primary }
 [:octicons-eye-16:](https://yubico.com/support/terms-conditions/privacy-notice){ .card-link title="Privacy Policy" }
@@ -85,7 +85,7 @@ The firmware of YubiKey is not updatable. If you want features in newer firmware
   ![Nitrokey](assets/img/security-keys/nitrokey.jpg){ width="300" }
 </figure>
 
-The Nitrokey 3 Series in general has a wide range of features such as [Universal 2nd Factor (U2F)](https://en.wikipedia.org/wiki/Universal_2nd_Factor), [FIDO2 and WebAuthn](basics/multi-factor-authentication.md#fido-fast-identity-online), Personal Identity Verification (PIV), OpenPGP, and TOTP and HOTP authentication. Currently, only the **Nitrokey 3A Mini** has [FIDO Level 1 Certification](https://nitrokey.com/news/2024/nitrokey-3a-mini-receives-official-fido2-certification).
+**Nitrokey** has a cost-effective security key capable of [FIDO2/WebAuthn and FIDO Universal 2nd Factor (U2F)](basics/multi-factor-authentication.md#fido-fast-identity-online) called the **Nitrokey Passkey**. For support for features such as PIV, OpenPGP, and TOTP and HOTP authentication, you need to purchase one of their other keys like the **Nitrokey 3**. Currently, only the **Nitrokey 3A Mini** has [FIDO Level 1 Certification](https://nitrokey.com/news/2024/nitrokey-3a-mini-receives-official-fido2-certification).
 
 [:octicons-home-16: Homepage](https://nitrokey.com){ .md-button .md-button--primary }
 [:octicons-eye-16:](https://nitrokey.com/data-privacy-policy){ .card-link title="Privacy Policy" }
@@ -95,7 +95,7 @@ The Nitrokey 3 Series in general has a wide range of features such as [Universal
 
 </div>
 
-The [comparison table](https://nitrokey.com/products/nitrokeys#:~:text=The%20Nitrokey%20Family) shows how the different Nitrokey models compare to each other in terms of features and other specifications.
+The [comparison table](https://nitrokey.com/products/nitrokeys#:~:text=The%20Nitrokey%20Family) shows how the different Nitrokey models compare to each other in terms of features and other specifications. Refer to Nitrokey's [documentation](https://docs.nitrokey.com/nitrokeys/features) for more details about the features available on your Nitrokey.
 
 Nitrokey models can be configured using the [Nitrokey app](https://nitrokey.com/download).
 
@@ -106,13 +106,6 @@ Excluding the Nitrokey 3, Nitrokeys which support HOTP and TOTP do not have encr
 
 </div>
 
-The **Nitrokey Passkey** is a cost-effective security key capable of [FIDO2 and WebAuthn](basics/multi-factor-authentication.md#fido-fast-identity-online). This key provides only basic FIDO2 functionality, but for most people that is all you will need. Some notable features the Nitrokey Passkey does **not** have include:
-
-- Tamper-resistant smart card
-- OpenPGP
-- NIST PIV
-- TOTP and HOTP
-
 ## Criteria
 
 **Please note we are not affiliated with any of the projects we recommend.** In addition to [our standard criteria](about/criteria.md), we have developed a clear set of requirements to allow us to provide objective recommendations. We suggest you familiarize yourself with this list before choosing to use a project, and conduct your own research to ensure it's the right choice for you.