its better not to enter the biome but stay in the edge of it. first goal is to find a crypt to get 30-40 iron and then go back to base to make the banded shield because bronze buckler is weak if you dont parry. also try to find turnip seeds to upgrade your cauldron to make sausages witch is very good hp food. and always have poison resist and try to avoid fight. and use the hoe to lvl up the ground so you dont step in water. swamp is pretty hard biome untill you get better equipment and get used to navigate in it. arrow fighting can help but running away is better...