When it comes to leather, leather can degrade and become more brittle if it dries out and is not cared for properly. Therefore, it is necessary to apply appropriate impregnations before using the furniture on a daily basis and to use them at intervals during use.
It all depends on the fabric with which your furniture is upholstered. The best way to avoid a stain is to drain the spilled liquid as soon as possible. In easy-to-clean fabrics with properly “protected fabric fibers”, it is almost 100% removable, provided you react quickly.