If you change a value (like gold) and it immediately snaps back to its original number when you buy something, you have likely edited a visual value rather than the server/logic value.
Idle Skilling saves progress in a text-based file (on PC: %AppData%/../LocalLow/LavaFlame/Idle Skilling ). You can:
: Once only a few addresses remain, move them to the bottom list and change the value to your desired amount. 3. Key Resources to Target According to community discussions on forums like FearLess Cheat Engine