How to make smooth loops
Either find the zero crossing (zero amplitude point). or make the loop many loops consecutively or contiguously .
If the amplitudes aren’t lined up on both sides then the endpoints are at different amplitudes. This results in an audible pop or click right at that point.
Incidentally if any of my loops are not right please tell me , I noticed that they sound rough on the player on this site so I downloaded one and it was ok but I would like to know if any are not right.
How to get a good recording or sample , first use a good Microphone the better the microphone the better the sound and then make as many takes as you can of anything you are recording .That way if you have for example traffic noise or anything that does not belong sooner or later you will get a good clear take.