robber1 completely right! Fillet is the best if you can afford it, you don't need to worry about keeping the flavour cos it is delicious whether rare or well-done, and it has a texture unlike any other steak. The less fuss the better. Other cuts take a wee bit more attention, e.g. sirloin can be tough (go to butcher's rather than buying in supermarket pack, and don't buy it too thin). Don't salt steak until it's sealed, then sprinkle some salt as it is cooking, if you salt it raw it's more likely to toughen. Marinating is excellent for (1) keeping steak tender and (2) colouring the steak right through (for those who don't really like to see any red bits). Easy marinade - olive oil and worcestershire sauce, a dash of whisky doesn't go amiss. If you press your finger on a coooked steak, the feeling will tell you how "done" it is - rare = soft and wobbly, medium = firm but springy, well done = very firm and unyielding. Any steak will continue to cook after you take it off the heat, so make allowances for that and undercook rather than overcook. Good luck!