(I'm never quite sure if it makes a difference to someone that I am an American English speaker so I keep leading with that just in case someone prefers British English.)
I use all three on a regular basis in everyday vernacular. ☺ However, I tend to use "although" more in writing papers.
'Though', 'although', and 'even though' have slightly different meanings, and when we use them depends on the sentence. The British Council has a good explanation here: https://learnenglish.britishcouncil.org/en/quick-grammar/spite-despite-although
I hope that helps!