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The shell uses `;` to reliably end a statement, with foreground execution. In some cases, a line break also ends a statement with foreground (except that when the statement is not obviously complete, a line break does not end it). (I don't know if "statement" is the technical term.)
~~When you want to end a statement, and execute it in the foreground, use `&` instead of `;`.~~
I personally always use `;` as if I were writing C code, unless running some one-liner interactively. IMO, the semicolons add readability.

The shell uses `;` to reliably end a statement, with foreground execution. In some cases, a line break also ends a statement with foreground (except that when the statement is not obviously complete, a line break does not end it). (I don't know if "statement" is the technical term.)
When you want to end a statement, and execute it in the background, use `&` instead of `;`.
I personally always use `;` as if I were writing C code, unless running some one-liner interactively. IMO, the semicolons add readability.