i found some topographical errors mainly missing spellings in one of my published papers. However the errors does not alter the meaning or concept of the paper. I contacted the joirnal editor but told me that it remains topographical error. Am just worried about it when readers find these mistakes. what do i do
As you discovered, journals usually don't correct typographical errors if the paper's meaning is unaffected. Publishing a correction is a lot of trouble, and they don't want to do it unless there is a compelling reason.
So there is nothing you can do. You will just have to live with those errors being there.
Perhaps it will motivate you to proofread your next paper more carefully before submitting.
Make all papers available on a website and update them if necessary.
I wouldn't update the website for typos, but I might update the offline paper to correct typos and later update the website should more significant changes be made.*
*Corrections, revisions, updates, etc., are time consuming, yet offer little reward; prioritise your time.