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+# 🔐 Certbot – SSL Certificate Management Guide
+
+## 📦 Install Certbot
+
+```bash
+apt install certbot
+```
+
+Installs **Certbot**, the free tool to automatically obtain and manage SSL/TLS certificates from **Let's Encrypt**.
+
+---
+
+## 🖥️ Method 1 – Standalone Mode
+
+```bash
+certbot certonly --standalone -d www.example.com
+```
+
+💡 **Standalone mode** runs its own temporary web server to complete the verification.
+
+* Use when no web server (Apache/Nginx) is running on the same port.
+* Certificates will be saved in:
+
+  * All versions: `/etc/letsencrypt/archive/`
+  * Latest version (symlink): `/etc/letsencrypt/live/`
+
+---
+
+## 🌐 Method 2 – Webroot Mode
+
+```bash
+certbot certonly --webroot --webroot-path <path> -d <domain>
+```
+
+📌 **Webroot mode** places a verification file in your website's public directory.
+
+* `<path>` = your website's document root (e.g., `/var/www/html`)
+* Use when your site is already running and accessible.
+
+---
+
+## 🛠️ Method 3 – Manual DNS Challenge
+
+```bash
+certbot certonly --manual --preferred-challenges dns -d <domain>
+```
+
+🔹 **DNS mode** requires you to manually add a TXT record to your domain’s DNS.
+
+* Best for **wildcard** certificates (`*.example.com`)
+* Works even without a running web server.
+
+---
+
+## ♻️ Renew Certificates
+
+### Automatic Renewal
+
+```bash
+certbot renew
+```
+
+* Renews all certificates close to expiration.
+
+### Force Renewal
+
+```bash
+certbot renew --force-renewal
+```
+
+* Renews certificates **immediately**, even if not expiring soon.
+
+---
+
+## 📅 Tips
+
+* Certificates expire every **90 days** — always set up **auto-renew**.
+* Test renewal without changes:
+
+```bash
+certbot renew --dry-run
+```
+
+* Restart your web server after renewal to apply new certificates:
+
+```bash
+systemctl restart nginx
+# or
+systemctl restart apache2
+```
+
+---
+
+✨ **With Certbot, your HTTPS setup can be fast, free, and automatic!** 🔒🚀