How to Easily Top Up MTN

Does anyone have tips on the best ways to top up MTN? I’ve tried a few methods, but I’m looking for the most efficient way to ensure I don’t run out of balance unexpectedly. I found a comprehensive guide on topping up MTN:https://mtnguide.ng/how-to-top-up-mtn/ that might help others as well. Any personal experiences or recommendations would be appreciated!