Language / "Na" and "W" , when to use? [15]

No rule for this. Memorize :-)

Language / Use of A/An/The ...... Articles [186]

You can use pronouns when needed. Ten, ta, to, ci, te.

Language / pronounce "Kocham Cię" [57]

My version:
ko-khum-che
as there is no "ch" sound in English and if you put "h" they read it as a real H which on the other hand Poles can't say...