You can use them interchangeably in recipes. However, they taste different, so sample all of them at some point to see which you like best. Vegetable oil, whatever type or variety, contains fat, but not cholesterol. Cholesterol is present only in animal products. There are several different kinds of dietary fat.
Wine vinegar is used for salad dressings and marinades.
Many kinds are available, including those made from sherry, champagne, and rice wine. Try a good brand of red-wine vinegar first, then sample others to see which you like best for particular foods. Sherry vinegar, for example, has a rich, intense taste, while rice-wine vinegar is milder. You may prefer the more robust variety in a marinade for meat, and the other in a dressing for shellfish salad. Balsamic vinegar is worthy.