Start with a free PDF to see if you like the format. Once you commit to reaching B1 (intermediate) or B2 (upper intermediate) level, invest in a paid PDF – it will save you hundreds of hours of confusion.
Italian articles change based on gender (masculine/feminine), number (singular/plural), and the starting letter of the following word. A good PDF will have tables for il, lo, la, i, gli, le and explain when to use un, uno, una, un’ . Gramatica Italiana Pdf