Getting solid equipment early is very important in a game that mainly consists of hacking and slashing through hordes of enemies. Diablo 2 is no different in this aspect, and getting better and better gear is an inherent part of its progression system. The (little) problem is, you will not always get what you need because of the random nature of loot; if you're lucky, you might be showered with magic, rare, and even unique items with affixes and suffixes needed for your build. If not, you might be gear-starved for a considerable part of the game and forced to rely on the basic equipment you get from vendors. Luckily, there is a way of improving your gear with stats and effects of your choice - It involves Diablo 2 Runes and forming Runewords out of them. You might think that it's equally RNG-heavy as just farming gear but's actually not. Firstly, if you know where to look for them, you are guaranteed to get some runes (random ones, but the method we'll show you is very consistent). Secondly, you know exactly what stats you will get as effects granted by runes and runewords are constant.Diablo 2 Resurrected Items
If you are lucky enough to find all the required Runes, you will get extremely powerful Runeword Items in Diablo 2 Resurrected which will carry you through the content. You can also buy D2R Runes with real money, for example on marketplaces like Odealo. Thirdly, obtaining socketed gear is much easier than you might think - Normal gear, sold by vendors, will sometimes have sockets; all you need to do to get it is relog a few times to force NPCs to update their stock and simply Buy socketed equipment. Of course, normal quality gear will not be enough in further acts, and you will want to add sockets to something better via the Horadric Cube, but that's another story.
Make no mistake, defeating The Countess might be very easy, but farming runes can be a chore, especially if you're after a specific Runeword (another reason to simply Buy Diablo 2 Runes). There are no ways of increasing drop rates or turning the odds in your favor (other than the fact that the chance of Countess dropping multiple runes lowers while there are multiple players present - this happens because of her unique loot calculations).