I am new to this forum and mountain biking so here is my question. I have an old Specialized Hard Rock from about 15 years ago. The frame is in good shape but it has been pretty neglected over the past 10 years or so. I am looking at getting into mountain biking seriously/semi seriously. My question is what should I look at getting to replace the components, what components should be replaced, and is it worth the time and money to replace or would I be better off buying a new entry/mid level bike? I am not looking for high end components but also don't want anything super cheap. So any advice is welcome. Thank you in advance!