To create websites like these (software), what steps should I follow?

[Piluen]

https://www.capterra.co.uk/
https://alternativeto.ne

What steps should I follow to create a WordPress-based software directory website similar to the ones mentioned above?

 

[Agentey]

The combination of Elementor Pro plugin and Hello Elementor theme.

 

[Beautype]

Rehub can be used for that purpose.

 

[Buggyro]

For creating this type of website, you can use listing themes. Moreover, if you want to design and create a website like this, you can use a combination of Elementor Pro, Hello Elementor theme, and Crocoblock.