In the famous Anapanasati sutta, or, for those who don’t read Pali, the Discourse on Mindfulness of Breathing, the Buddha begins his meditation instructions by describing the way the meditator should sit. “[The meditator] … sits down folding his legs crosswise, holding his body erect, and setting mindfulness to the fore.”
There is a lot of advice out there on the best or proper way to sit during meditation. For some teachers, the exact sitting posture is extremely important, while for others, it is only mentioned in passing. I feel that meditation can and should be done in any position that is convenient, so I tend to approach the topic of sitting posture from a pragmatic perspective.
The following infographic sums up my advice for how to sit during meditation