I\'m trying to migrate from Eclipse to IDEA. In Eclipse, when I hit the TAB key while typing in function parameters and in other contextual situations it will forward the cursor
There is not direct equivalent to this action. See completion features page for the advanced features.
Regarding the semicolon insertion see Webstorm/Intellij put ";" always at the end of line.
See also Things possible in Eclipse that aren’t possible in IntelliJ?.