Searching the forum for “SmartThings bridge” came up with a few posts about it. Specifically, this one…
Being a former ST convert a couple years ago, I can tell you that the freedom of OH is exactly what I was hoping for, but unable to get from ST. A bridge may be helpful to start migrating to OH, but I recommend controlling your devices directly in the long-term.
I have found these forums friendly and full of a LOT of very helpful people… so relax, setup a stable system that is capable of infinite tweaking, ask, learn, and SHARE!