Can I usually do a 301 redirect when changing a domain?

Question

Search Engine Optimization

Blog 1.5 months, about 100 posts.
Changed domain.
I copied the site, the database too, I replaced the site address in the database. Put a normal redirect. When you go to any article of the old site, you will be redirected to the main page of the new site. So I think, maybe it is necessary to make sure that the url of the post on the old site leads to the url of the same post on the new site?