>>158758For vines (raspberry, blackberry, ..) you can use the method this
>>158780 helpful anon suggested. I used it twice and it worked out great both times. Practically foolproof. They can grow roots at every leaf-node that gets buried.
Others, like strawberries send out horizontal stems without leaves or nodes though. They will however start growing a small plant on it (google 'plantlet') that'll weigh the horizontal stem down. If it touches ground it roots even faster than the method for vining plants.
Googlepic related; motherplant with a small plantlet attached via a leafless horizontal stem.