how to insert clip in timeline without affecting the timing

how can I insert a clip in my timeline without affecting all the other tracks that have audio and pictures/video inserts timed to show at a specific frame on the timeline?
whenever I forget to insert a clip I get faced with the same problem - I have to go back the whole length of the timeline and manually re-sync all the music tracks, special FX, voice over... there's got to be a way I'm sure but can't find any videos or written material about this topic.
I am fairly new to video editing and at the beginning i had one track of video and audio, but now I am capable to inserting a lot more but i am also spending an incredible amount of time re-syncing everything everything when I forget a clip or decide to remove part of a clip. can someone point me in the right direct please?
whenever I forget to insert a clip I get faced with the same problem - I have to go back the whole length of the timeline and manually re-sync all the music tracks, special FX, voice over... there's got to be a way I'm sure but can't find any videos or written material about this topic.
I am fairly new to video editing and at the beginning i had one track of video and audio, but now I am capable to inserting a lot more but i am also spending an incredible amount of time re-syncing everything everything when I forget a clip or decide to remove part of a clip. can someone point me in the right direct please?