XAMPP SSL Tutorial https://shellcreeper.com/?p=2573

cert.conf

[ req ]

default_bits        = 2048
default_keyfile     = server-key.pem
distinguished_name  = subject
req_extensions      = req_ext
x509_extensions     = x509_ext
string_mask         = utf8only

[ subject ]

countryName                 = Country Name (2 letter code)
countryName_default         = US

stateOrProvinceName         = State or Province Name (full name)
stateOrProvinceName_default = NY

localityName                = Locality Name (eg, city)
localityName_default        = New York

organizationName            = Organization Name (eg, company)
organizationName_default    = Example, LLC

commonName                  = Common Name (e.g. server FQDN or YOUR name)
commonName_default          = {{DOMAIN}}

emailAddress                = Email Address
emailAddress_default        = [email protected]

[ x509_ext ]

subjectKeyIdentifier   = hash
authorityKeyIdentifier = keyid,issuer

basicConstraints       = CA:FALSE
keyUsage               = digitalSignature, keyEncipherment
subjectAltName         = @alternate_names
nsComment              = "OpenSSL Generated Certificate"

[ req_ext ]

subjectKeyIdentifier = hash

basicConstraints     = CA:FALSE
keyUsage             = digitalSignature, keyEncipherment
subjectAltName       = @alternate_names
nsComment            = "OpenSSL Generated Certificate"

[ alternate_names ]

DNS.1       = {{DOMAIN}}

certificate for wildcard subdomain, for example https://webku.lokal https://www.webku.lokal https://any.webku.lokal
replace

DNS.1       = {{DOMAIN}}

with

DNS.1       = *.{{DOMAIN}}
DNS.2       = {{DOMAIN}}

or

DNS.1       = *.webku.lokal
DNS.2       = webku.lokal

httpd-ssl.conf example

<VirtualHost *:443>
    DocumentRoot D:/xampp/htdocs/webku.lokal
    ServerName webku.lokal
    ServerAlias *.webku.lokal
    SSLEngine on
    SSLCertificateFile "crt/webku.lokal/server.crt"
    SSLCertificateKeyFile "crt/webku.lokal/server.key"
	<Directory "D:/xampp/htdocs/webku.lokal">
        Options All
	AllowOverride All
	Require all granted
    </Directory>
</VirtualHost>

It works for me!

I have been working on the issue of securing my localhost but at last, the most valid explanation to be true....
Hands up.... the complete version link here >>> https://gist.github.com/adriansuter/f197dac4cf8570c2214642fa15299c33#file-cert-template-conf

I have been working on the issue of securing my localhost but at last, the most valid explanation to be true.... Hands up.... the complete version link here >>> https://gist.github.com/adriansuter/f197dac4cf8570c2214642fa15299c33#file-cert-template-conf

Thanks @lukademinnosa , this is the BEST code I found.
I suggest others to use it.