If you're about to handle X509 certificates and don't want to remember/google a handful of openssl commands you can use the graphical tool XCAShow archive.org snapshot.
Setup
Install XCA sudo apt install xca
Create a new database with a strong master password
Features
Create CSR
Verify SSL private key matches SSL certificate
enable Key name column
import certificate and private key
Import, export and convert PKCS#12, PKCS#7, PEM chain, DER and more
Check issuer chain
import certificate, intermediate and root ca
they get automatically chained
View certificates and export openssl config
Check revocation lists
Setup a private PKI
A lot more...
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