So my chain won't go to the big ring.. It gets caught in the derailer and can't pedal forward.. In the middle ring it rubs against the derailer but over all is rideable... I am a amateur n practically know jack about fixing stuff.. At least on bikes... O yea n it's on my mtb

check this link ... maybe you will find some help !!!
https://bicycletutor.com/adjust-front-derailer/

Check your local library for bicycle maintenance books. This way, when attempting to fix it, you'll have the book handy for illustrations and instructions.

There should be a FAQ for your problem.

I could train a chimpanzee to tune a rear derailleur but fronts are much more difficult to adjust. Additionally, every adjustment that you make affects the subsequent adjustments so, once it's screwed up, making random adjustments is seldom beneficial.

The Park Tool website has a good, clear set of step-by-step directions for adjusting front derailleurs. My advice is to completely disconnect the shift cable so you can start over from the very beginning with the position of the derailleur on the seat tube. Then follow all of the steps in order - that's important.

Good luck.