Sourdough and Starters

Hollow loaves, no ear

First bake in a while

Complete fail with enriched dough

So what happened?

Dough doesn't get elastic / tears

steam

Starting a starter with vinegar?

Why does SD Bread get more sour with time?

After relocation, starter/levains behavior changed. Why isn't my levain rising-to-double anymore?

Expert advice needed please! Over or underfermented?