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+<header><h1>
+Lab OpenSSL & Certificates
+</h1></header>
+
+----------
+
+A certificate is a digital document that certifies the ownership of a public key by the named subject of the certificate.
+The certificate is signed by a certificate authority (CA) that is trusted by the parties who trust the certificate.
+The certificate authority is responsible for verifying the identity of the certificate holder and signing the certificate.
+
+## Create an RSA key
+```bash
+openssl genrsa -out <name>.key 2048
+```
+
+## Self-sign root certificate 
+```bash
+openssl req -new -x509 -days 365 -key ca.key -config ca.cnf -out ca.crt
+```
+
+## Create a request
+```bash
+openssl req -new -sha256 -key <my_site>.key -config <my_site>.cnf -out <my_site>.csr
+```
+
+## Sign a request with root certificate
+```bash
+openssl ca -config ca_ssl.cnf -in <my_site>.csr -out <my_site>.crt
+```
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