Looking for help with Japanese verbs "iku" and "kuru" D:

[tammzii]

For the longest time in my Japanese class, we've been saying things like "Gakkou ni ikimasu". However, an example sentence from my teacher about how she spends her day was "Gakkou ni kimasu". I tried asking her why she didn't use the word "ikimasu" instead of "kimasu", but I didn't understand her explanation. My textbook also confuses me. I tried searching online but I don't understand what "movement towards/away from the speaker means. If anyone knows how "iku" and "kuru" are used, please inform me!