I have to develop a table that would contain distance between destinations and need some assistance for that. I am right now almost blank on how to start

here the table show distance from point A to A, B, C AND D ARE 0, 4, 8, AND 12 respectively and so on.
need to transform this data in MySQL table to be managed by admin panel and used at client site depending on from and to destination.
Regards
In case you don’t have “real” date (like geolocation) you will need to store the data in 2 tables.
First table, locations (so store A,B,C,D there, and other relevant information about the location)
Second table, 3 columns. from_location, to_location, distance. (with a key on from/to_location so it is unique. But always check for the other way around before inserting, as you can support A,C and C,A in your table)
This way you can easily extract the correct data from the database.
For example, getting the distance from A to C (
SELECT distance FROM distance_table WHERE from_location = "A" AND to_location = "C")