need technical guest posting sites list

I am new in SEO. I have a technical blog site. I am the author for it. I am looking for few guest posting sites where I can post few post so that I can build some important backlink. if there is anyone who wants to invite me for guest posting please knock me . I would like to give you simple gist about my writing. my website: https://www.sysnetprotech.com forum: https://forum.sysnetprotech.com