Ok, well im kinda new at learning russian and i just have a couple of questions. Sometimes, when I listen to russian songs, i hear some of these words

же
тот же
то что

What do those mean and also, you know how there are some endings to words like -то and -нибудь (ex. что-то где-то) are there anymore endings like those and if there are, could you please explain

I have a hard time figuring out the cases and how to change word endings according to those. So, could anyone please help me?