diff --git a/README.md b/README.md
index 3424b58..a68b959 100644
--- a/README.md
+++ b/README.md
@@ -10,31 +10,6 @@ nixos-rebuild switch --flake flake_path_directory#hostname
 nix flake update --extra-experimental-features "nix-command flakes"
 ```
 
-## Configure VM
-
-Configure VM
-```nix
-users.users.<user>.initialPassword = "<password>";
-virtualisation.vmVariant = {
-  # following configuration is added only when building VM with build-vm
-  virtualisation = {
-    memorySize = <RAM in MiB>; # Use 8192MiB memory.
-    cores = <CPU Core number>;
-    # And more here https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/virtualisation/qemu-vm.nix     
-  };
-};
-```
-
-Build
-```bash
-nixos-rebuild build-vm --flake .#nixos-test
-```
-
-Run
-```bash
-./result/bin/run-nixos-vm-vm
-```
-
 ## Show changements between revisions
 
 
@@ -72,36 +47,6 @@ error: cached failure of attribute 'nixosConfigurations.perso-desktop.config.sys
 sudo rm -fr /root/.cache/nix/
 ```
 
-## If package is marked as insecure
-
-Example:
-
-> error: Package 'nix-2.16.2' in /nix/store/nra828scc8qs92b9pxra5csqzffb6hpl-source/pkgs/tools/package-management/nix/default.nix:229 is marked as insecure, refusing to evaluate.
->
-> Known issues:
-> - CVE-2024-27297
-
-```bash
-nix path-info -r /run/current-system | grep nix-2.16.2
-```
-Result:
-> [...]
->
-> /nix/store/g4ss2h40n3j37bq20x1qw5s7nl82lch5-nix-2.16.2
->
-> [...]
-
-```bash
-nix-store -q --referrers /nix/store/g4ss2h40n3j37bq20x1qw5s7nl82lch5-nix-2.16.2
-```
-Result:
-> /nix/store/g4ss2h40n3j37bq20x1qw5s7nl82lch5-nix-2.16.2
->
-> /nix/store/72pfc05339izcwqhlbs8441brrdasas7-nix-2.16.2-dev
->
-> /nix/store/ln2z5d5izn8icm3wx94ci13ad19lzjhr-nixd-1.2.3
-
-nixd is not up to date and require nix 2.16.2
 
 ## To limit resources use during build
 
diff --git a/tips/debug_insecure_package.md b/tips/debug_insecure_package.md
new file mode 100644
index 0000000..837ca9c
--- /dev/null
+++ b/tips/debug_insecure_package.md
@@ -0,0 +1,30 @@
+## If package is marked as insecure
+
+Example:
+
+> error: Package 'nix-2.16.2' in /nix/store/nra828scc8qs92b9pxra5csqzffb6hpl-source/pkgs/tools/package-management/nix/default.nix:229 is marked as insecure, refusing to evaluate.
+>
+> Known issues:
+> - CVE-2024-27297
+
+```bash
+nix path-info -r /run/current-system | grep nix-2.16.2
+```
+Result:
+> [...]
+>
+> /nix/store/g4ss2h40n3j37bq20x1qw5s7nl82lch5-nix-2.16.2
+>
+> [...]
+
+```bash
+nix-store -q --referrers /nix/store/g4ss2h40n3j37bq20x1qw5s7nl82lch5-nix-2.16.2
+```
+Result:
+> /nix/store/g4ss2h40n3j37bq20x1qw5s7nl82lch5-nix-2.16.2
+>
+> /nix/store/72pfc05339izcwqhlbs8441brrdasas7-nix-2.16.2-dev
+>
+> /nix/store/ln2z5d5izn8icm3wx94ci13ad19lzjhr-nixd-1.2.3
+
+nixd is not up to date and require nix 2.16.2
diff --git a/tips/how_to_test_pr.md b/tips/how_to_test_pr.md
new file mode 100644
index 0000000..4c3af1f
--- /dev/null
+++ b/tips/how_to_test_pr.md
@@ -0,0 +1,34 @@
+# Example for ollama
+
+{ config, pkgs, lib, ... }:
+
+with lib;
+let
+  cfg = config.modules.system.server.ollama;
+  nvidiaEnabled = config.modules.system.hardware.nvidia.enable;
+  nixpkgsPr = builtins.fetchTarball {
+    url = "https://github.com/abysssol/nixpkgs/archive/ollama-driver-runpath.tar.gz";
+    sha256 = "1ixfvdpi2v4r9yrkvqnfk9whs8lyjhrkdph47bcznh8ak9aipr8p";
+  };
+in
+{
+  disabledModules = [ "services/misc/ollama.nix" ];
+  imports = [
+    (import "${nixpkgsPr}/nixos/modules/services/misc/ollama.nix")
+  ];
+
+  options.modules.system.server.ollama = {
+    enable = mkEnableOption ''
+      Enable ollama with my custom configurations
+    '';
+  };
+  config = mkIf cfg.enable {
+    services.ollama = {
+      enable = true;
+
+      package = (import nixpkgsPr { inherit (pkgs) system; config.allowUnfree = true; }).ollama;
+
+      acceleration = if nvidiaEnabled then "cuda" else null;
+    };
+  };
+}
diff --git a/tips/test_on_vm.md b/tips/test_on_vm.md
new file mode 100644
index 0000000..ddaab4b
--- /dev/null
+++ b/tips/test_on_vm.md
@@ -0,0 +1,24 @@
+## Configure VM
+
+Configure VM
+```nix
+users.users.<user>.initialPassword = "<password>";
+virtualisation.vmVariant = {
+  # following configuration is added only when building VM with build-vm
+  virtualisation = {
+    memorySize = <RAM in MiB>; # Use 8192MiB memory.
+    cores = <CPU Core number>;
+    # And more here https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/virtualisation/qemu-vm.nix
+  };
+};
+```
+
+Build
+```bash
+nixos-rebuild build-vm --flake .#nixos-test
+```
+
+Run
+```bash
+./result/bin/run-nixos-vm-vm
+```