You have the internet yes? What games do you play? Now search for that game and benchmarks. Example: search for "Overwatch benchmarks". You will get links to sites that tested the game on various videocards. Look at some of these benchmarks and note which cards run the game well. Make a list of these cards for each game you play.
Now, for each card on that list do a search on Newegg or where ever you will buy your card. Which ones are in your budget? Those are your choices. Then come back here, list the basic information about your computer(CPU, power supply) and list your choices. People will advise which one is best for you.