Combining different colours

I’m a beginner on knitting :oops: … and I’m currently trying to work on a small project where you have to occasionally change colours. I had been experimenting with all kinds of different methods that I see on this website :pout: , but the biggest problem I have is that I want both sides of my project to look nice, and sometimes I only want one stitch of a different colour, and some methods won’t work as good as I expected… maybe I did something improperly? :?? or are there any other good methods that you can recommand? Thank u so much for reading my long post… I’ll appreciate any help you can provide :notworthy: