diff --git a/doc/guides/commit-queue.md b/doc/guides/commit-queue.md
index 33f4924f7fdb5c..8c3fca28ec605f 100644
--- a/doc/guides/commit-queue.md
+++ b/doc/guides/commit-queue.md
@@ -1,4 +1,4 @@
-# Commit Queue
+# Commit queue
 
 > Stability: 1 - Experimental
 
@@ -37,7 +37,7 @@ From a high-level, the Commit Queue works as follow:
       3. Close the PR
       4. Go to next PR in the queue
 
-## Current Limitations
+## Current limitations
 
 The Commit Queue feature is still in early stages, and as such it might not
 work for more complex Pull Requests. These are the currently known limitations
@@ -106,7 +106,7 @@ If no errors happen during `git node land`, the script will use the
 `Landed in ...` comment in the PR, and then will close it. Iteration continues
 until all PRs have done the steps above.
 
-## Reverting Broken Commits
+## Reverting broken commits
 
 Reverting broken commits is done manually by Collaborators, just like when
 commits are landed manually via `git node land`. An easy way to revert is a
diff --git a/doc/guides/diagnostic-tooling-support-tiers.md b/doc/guides/diagnostic-tooling-support-tiers.md
index 1bff8774562f90..7672606c8fad99 100644
--- a/doc/guides/diagnostic-tooling-support-tiers.md
+++ b/doc/guides/diagnostic-tooling-support-tiers.md
@@ -1,4 +1,4 @@
-# Diagnostic Tooling Support Tiers
+# Diagnostic tooling support tiers
 
 Diagnostic tooling is important to the consumers of Node.js. It is used both
 in development and in production in order to investigate problems.  The failure
diff --git a/doc/guides/investigating_native_memory_leak.md b/doc/guides/investigating_native_memory_leak.md
index f0a156286e3e5f..55ba1b1ec3d60b 100644
--- a/doc/guides/investigating_native_memory_leak.md
+++ b/doc/guides/investigating_native_memory_leak.md
@@ -1,4 +1,4 @@
-# Investigating Memory Leaks with valgrind
+# Investigating memory leaks with valgrind
 
 A Node.js process may run out of memory due to excessive consumption of
 native memory. Native Memory is memory which is not managed by the
diff --git a/doc/guides/maintaining-icu.md b/doc/guides/maintaining-icu.md
index 8de05a085bf041..bf000e5fd9027c 100644
--- a/doc/guides/maintaining-icu.md
+++ b/doc/guides/maintaining-icu.md
@@ -33,7 +33,7 @@ $ node -p process.versions
 }
 ```
 
-### Time Zone Data
+### Time zone data
 
 Time zone data files are updated independently of ICU CLDR data.  ICU and its
 main data files do not need to be upgraded in order to apply time zone data file
@@ -50,7 +50,7 @@ in the icu/icu-data repository.
 All modern versions of Node.js use the version 44 ABI of the time zone data
 files.
 
-#### Example: Updating the ICU `.dat` File
+#### Example: updating the ICU `.dat` file
 
 * Decompress `deps/icu/source/data/in/icudt##l.dat.bz2`, where `##` is
   the ICU major version number.
@@ -68,7 +68,7 @@ files.
 * Build, test, verifying `process.versions.tz` matches the desired version.
 * Create a new minor version release.
 
-## Release Schedule
+## Release schedule
 
 ICU typically has >1 release a year, particularly coinciding with a major
 release of [Unicode][]. The current release schedule is available on the [ICU][]
@@ -237,7 +237,7 @@ You should see a message such as:
 INFO: Using floating patch "tools/icu/patches/63/source/tools/toolutil/pkg_genc.cpp" from "tools/icu"
 ```
 
-### Clean Up
+### Clean up
 
 Any patches older than the minimum version given in `tools/icu/icu_versions.json`
 ought to be deleted, because they will never be used.
diff --git a/doc/guides/maintaining-npm.md b/doc/guides/maintaining-npm.md
index bf789af65b3c7f..5536fd513f8552 100644
--- a/doc/guides/maintaining-npm.md
+++ b/doc/guides/maintaining-npm.md
@@ -38,7 +38,7 @@ $ git commit -m "doc: update npm LICENSE using license-builder.sh"
 
 Note: please ensure you are only making the updates that are changed by npm.
 
-## Step 4: Apply Whitespace fix
+## Step 4: Apply whitespace fix
 
 ```console
 $ git rebase --whitespace=fix master
diff --git a/doc/guides/maintaining-openssl.md b/doc/guides/maintaining-openssl.md
index 75be7c10ba3957..ad947a4ddfafeb 100644
--- a/doc/guides/maintaining-openssl.md
+++ b/doc/guides/maintaining-openssl.md
@@ -8,7 +8,7 @@ This document describes how to update `deps/openssl/`.
 * `nasm` (<https://www.nasm.us/>) Version 2.11 or higher is needed.
 * GNU `as` in binutils. Version 2.26 or higher is needed.
 
-## 0. Check Requirements
+## 0. Check requirements
 
 ```console
 % perl -v
diff --git a/doc/guides/maintaining-root-certs.md b/doc/guides/maintaining-root-certs.md
index e14e2d8eca0756..8ab3764aac53bf 100644
--- a/doc/guides/maintaining-root-certs.md
+++ b/doc/guides/maintaining-root-certs.md
@@ -1,4 +1,4 @@
-# Maintaining the Root Certificates
+# Maintaining the root certificates
 
 Node.js contains a compiled-in set of root certificates used as trust anchors
 for TLS certificate validation.
diff --git a/doc/guides/maintaining-the-build-files.md b/doc/guides/maintaining-the-build-files.md
index 433b387e5ee20e..548441dc0126ca 100644
--- a/doc/guides/maintaining-the-build-files.md
+++ b/doc/guides/maintaining-the-build-files.md
@@ -1,4 +1,4 @@
-# Maintaining the Build files
+# Maintaining the build files
 
 This document explains how to maintain the build files in the codebase.