I started studying Korean a few days ago though this site https://www.howtostudykorean.com and in the first few lessons it taught me to pronounce ㅆ as 'ss'. But then I reached lesson 5 and listened to this recording https://www.howtostudykorean.com/wp-content/uploads/2014/12/Lesson-5-6-I-ate-rice.mp3 of this example:
나는 밥을 먹었다
And she clearly says "mokotta" and not "mokossta". So where is that ㅆ? I studied Japanese beforehand so I'm assuming ㅆ is actually more like っつ? Maybe at the end of a syllable it becomes something like っ?