How to link the title in a teaser to the main content?
If you are using a node title field, then the "Link this field to its entity" option should definitely work.

By default it will link to

localhost:8082/node/123

where 123 is the node ID of the node.

If you want a nicer URL, like

localhost:8082/title

where title is the title of the node (or something similar), try the pathauto module, which allows you to define settings that automatically create pretty urls for nodes (and users and taxonomy terms, etc.).
The pretty urls can use tokens, like [node:title], which will be replaced by the title of the node for example.