I will for my new website a Community like these one. How can I build this. Thank you for your help
This is the software used to build this community platform: https://discourse.org/
https://circle.so/ is also a good community platform builder
Depending on budget and needs you could consider https://www.heartbeat.chat/ as a community platform builder as well. On the basic plan compared to Circle they offer an in-built affiliate program for members and a courses module for example.