edosan86 wrote:
the keys on the far left and the far right and all of the numbers and punctuation marks are incorrectly assigned
If you would provide specific details I could probably tell you what input source you have mistakenly activated.
In any case, you need to do what Luis said and ideally make sure you have only one item on the Input Source list, and that the name of that item is US or ABC (or whatever is appropriate for your language).
The active input source is determined by what you see in the "flag" menu at the top right of the screen (and NOT by what you have selected in the Keyboard/Input Source list).
If you are using a Japanese keyboard, let us know right away, as there are some special issues that can arise in that situation.