diff --git a/knowledge base/buildah.md b/knowledge base/buildah.md
index 810dcab..416183c 100644
--- a/knowledge base/buildah.md	
+++ b/knowledge base/buildah.md	
@@ -70,15 +70,22 @@ buildah config --port '80' 'wc-fedora'
 buildah commit 'starting-working-container' 'alpine-custom'
 buildah commit --rm 'working-container-removed-after-commit' 'oci-archive:/tmp/alpine-custom.tar'
 
-# Create images from Dockerfiles.
-# The current directory is used as default context path.
+# Create images.
 buildah build -t 'fedora-http-server'
 buildah build --pull -t '012345678901.dkr.ecr.eu-east-2.amazonaws.com/me/my-alpine:0.0.1' 'dockerfile-dir'
+buildah build --manifest 'me/my-alpine:0.0.1' --platform 'linux/amd64,linux/arm64/v8'
+buildah build … --output 'type=tar,dest=/tmp/alpine.tar'
+
+# Inspect stuff.
+buildah inspect 'fedora-http-server'
+buildah inspect -t 'image' 'cfde91e4763f'
+buildah manifest inspect 'me/my-alpine:0.0.1'
 
 # Push images.
 buildah push 'cfde91e4763f' 'docker://registry.example.com/repository:tag'
 buildah push --disable-compression 'localhost/test-image' 'docker-daemon:test-image:3.0'
 buildah push --creds 'kevin:secretWord' --sign-by '7425…109F' 'docker.io/library/debian' 'oci:/path/to/layout:image:tag'
+buildah manifest push
 
 # Remove working containers.
 buildah rm 'fedora-http-server'
@@ -126,7 +133,9 @@ buildah rm --all \
 
 - [Tutorial: Use Buildah in a rootless container with GitLab Runner Operator on OpenShift]
 - [Building container image in AWS CodeBuild with buildah]
+- [Building multi-architecture containers with Buildah]
 - [Use Buildah to build OCI container images]
+- [Containers-transports man page]
 
 <!--
   References
@@ -143,5 +152,7 @@ buildah rm --all \
 
 <!-- Others -->
 [building container image in aws codebuild with buildah]: https://dev.to/leonards/building-container-image-in-aws-codebuild-with-buildah-8gk
+[building multi-architecture containers with buildah]: https://medium.com/oracledevs/building-multi-architecture-containers-with-buildah-44ed100ec3f3
+[containers-transports man page]: https://man.archlinux.org/man/extra/containers-common/containers-transports.5.en
 [tutorial: use buildah in a rootless container with gitlab runner operator on openshift]: https://docs.gitlab.com/ee/ci/docker/buildah_rootless_tutorial.html
 [use buildah to build oci container images]: https://www.linode.com/docs/guides/using-buildah-oci-images/
diff --git a/knowledge base/cloud computing/aws/ecr.md b/knowledge base/cloud computing/aws/ecr.md
index 74715ce..7eb4613 100644
--- a/knowledge base/cloud computing/aws/ecr.md	
+++ b/knowledge base/cloud computing/aws/ecr.md	
@@ -10,6 +10,11 @@
 ```sh
 # List and get information about the repositories in ECRs.
 aws ecr describe-repositories
+aws ecr describe-repositories --repository-names 'docker-tools/image-builder'
+aws ecr describe-repositories --registry-id '123456789012' --query 'repositories[].repositoryName'
+
+# Create repositories.
+aws ecr create-repository --repository-name 'docker-tools/image-builder'
 
 # List images in ECRs.
 aws ecr list-images --repository-name 'repository'
@@ -21,7 +26,7 @@ aws ecr get-login-password \
 | docker login --username 'AWS' --password-stdin 'aws_account_id.dkr.ecr.region.amazonaws.com' \
 
 # Pull images from ECRs.
-docker 'pull aws_account_id.dkr.ecr.region.amazonaws.com/repository_name/image_name:tag'
+docker pull 'aws_account_id.dkr.ecr.region.amazonaws.com/repository_name/image_name:tag'
 
 
 # List and show pull through cache rules.
@@ -52,6 +57,11 @@ docker pull '123456789012.dkr.ecr.eu-south-1.amazonaws.com/docker-hub/library/ng
 docker pull '123456789012.dkr.ecr.us-west-2.amazonaws.com/docker-hub/grafana/grafana'
 ```
 
+```sh
+aws ecr describe-repositories --repository-names 'docker-tools/image-builder' \
+|| aws ecr create-repository --repository-name 'docker-tools/image-builder'
+```
+
 ## Pull through cache feature
 
 > **Note:** when requesting an image for the first time using the pull through cache, the ECR creates a new repository for that image.<br>
diff --git a/knowledge base/docker.md b/knowledge base/docker.md
index 334ac43..dfdb332 100644
--- a/knowledge base/docker.md	
+++ b/knowledge base/docker.md	
@@ -309,8 +309,10 @@ docker load …
 - [Configuring DNS]
 - [Cheatsheet]
 - [Getting around Docker's host network limitation on Mac]
+- [Dockerfile reference]
 - [Building multi-arch images for ARM and x86 with Docker Desktop]
 - [OpenContainers Image Spec]
+- [Docker ARG, ENV and .env - a Complete Guide]
 
 <!--
   References
@@ -324,11 +326,13 @@ docker load …
 
 <!-- Upstream -->
 [building multi-arch images for arm and x86 with docker desktop]: https://www.docker.com/blog/multi-arch-images/
+[dockerfile reference]: https://docs.docker.com/reference/dockerfile/
 [github]: https://github.com/docker
 
 <!-- Others -->
 [arch linux wiki]: https://wiki.archlinux.org/index.php/Docker
 [cheatsheet]: https://collabnix.com/docker-cheatsheet/
 [configuring dns]: https://dockerlabs.collabnix.com/intermediate/networking/Configuring_DNS.html
+[docker arg, env and .env - a complete guide]: https://vsupalov.com/docker-arg-env-variable-guide/
 [getting around docker's host network limitation on mac]: https://medium.com/@lailadahi/getting-around-dockers-host-network-limitation-on-mac-9e4e6bfee44b
 [opencontainers image spec]: https://specs.opencontainers.org/image-spec/
diff --git a/knowledge base/git.md b/knowledge base/git.md
index d76f3a7..98fcf29 100644
--- a/knowledge base/git.md	
+++ b/knowledge base/git.md	
@@ -143,6 +143,14 @@ git commit --amend --no-edit --gpg-sign
 # Show commits which would be pushed.
 git log @{u}..
 
+# Get the current commit SHA.
+git rev-parse 'HEAD'
+git show -s --format=%H
+
+# Get the current commit SHA in short form.
+git rev-parse --short 'HEAD'
+git show -s --format=%h
+
 # Revert a commit, but keep the history of the event as a separate commit.
 git revert 'commit_hash'
 
@@ -1003,7 +1011,7 @@ git -c http.sslVerify=false …
 - [How to manage your secrets with git-crypt]
 - Question about [how to rebase a local branch with remote master]
 - Question about how to [merge master into a feature branch]
-- Question about how to [prune local branches that do not exist on remote anymore]
+- Question about how to [prune local tracking branches that do not exist on remote anymore]
 - Question about how to [rebase remote branches]
 - Quick guide about [git rebase][rebase quick guide]
 - Quick guide about how to [remove files from git commit]
diff --git a/knowledge base/gitlab.md b/knowledge base/gitlab.md
index 66d01ee..80f38f3 100644
--- a/knowledge base/gitlab.md	
+++ b/knowledge base/gitlab.md	
@@ -548,6 +548,7 @@ Solution: give that user _developer_ access or have somebody else with enough pr
 - [Caching in CI/CD]
 - [Predefined CI/CD variables reference]
 - [Tutorial: Use Buildah in a rootless container with GitLab Runner Operator on OpenShift]
+- [Use kaniko to build Docker images]
 
 <!--
   References
@@ -588,6 +589,7 @@ Solution: give that user _developer_ access or have somebody else with enough pr
 [tutorial: use buildah in a rootless container with gitlab runner operator on openshift]: https://docs.gitlab.com/ee/ci/docker/buildah_rootless_tutorial.html
 [use ci/cd configuration from other files]: https://docs.gitlab.com/ee/ci/yaml/includes.html
 [use extends to reuse configuration sections]: https://docs.gitlab.com/ee/ci/yaml/yaml_optimization.html#use-extends-to-reuse-configuration-sections
+[use kaniko to build docker images]: https://docs.gitlab.com/ee/ci/docker/using_kaniko.html
 
 <!-- Others -->
 [authenticating your gitlab ci runner to an aws ecr registry using amazon ecr docker credential helper]: https://faun.pub/authenticating-your-gitlab-ci-runner-to-an-aws-ecr-registry-using-amazon-ecr-docker-credential-b4604a9391eb