Securing website without domain name


Yesterday I installed the LAMP stack successfully with this tutorial At the end of the tutorial they say that you should secure Apache with Let’s Encrypt but that only works if you have a domain and i don’t have one.

So my question is if there are other ways to secure Apache if you only use the public ip to connect to my website?

I have set up a basic ufw firewall.

Another question I have is: Is it safe to share the public ip so people can look at my site? I have looked at this question but would like a better confirmation that it is safe to share it.

P.S. I don’t really need a domain since I will mainly use the site as portfolio site to show to employers and for school.

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****Self sign the certificate

openssl req -x509 -newkey rsa:4096 -nodes -out cert.pem -keyout key.pem -days 365

Run the command, by running this command two files are created cert.pem and key.pem , in this process it will ask few questions which are necessary to create certificate . Since we have passed days argument as 365, it is valid for another one year.

As I mentioned in that question, there is no risk. You can use a self-signed cert if you want SSL.