Hey there!
If you're starting off in Core, a great place to start is our documentation page HERE which has a lot of tutorials on both using the editor as well as introductory scripting in Lua, the language Core uses for scripting. If videos are more helpful for you , also check out the Core Games YouTube Channel which has a lot of video tutorials on the program created by Manticore staff!
If the information on the documentation hub doesn't solve the issue, our community on the Core Hub Discord has a very active user base of Core creators and moderators who can help you with learning the ropes of the Core Editor as well!