There is a complete site dedicated to Engineering
Engineering Stack Exchange is a question and answer site for professionals and students of engineering. It's built and run by you as part of the Stack Exchange network of Q&A sites. With your help, we're working together to build a library of detailed answers to every question about engineering.
You can take their tour and visit their Help centre to learn if the topics match your interest.
If not there is always the full list of sites with other sites with types of engineering:
each site has a dedicated help center, be sure to visit those, see what type of questions are asked, learn to recognize which question do well, study their tags and tag wiki's, familiarize yourself with search etc before you ask your own question on any of these sites.