The two quoted posts are WISDOM.
Points to emphasize:
1.) Common moves/techiques. There is a lot of bridging, shrimping, posting, sitting out, and "switching" in grappling.
2.) Defense - I am not talking about "escapes proper" but rather postures and positions that keep you out of trouble or make you difficult to submit. Don't be afraid to tap, but not having to or simply being "tough to sub" makes showing up more fun.
Things like trying to be on only one of your hips/ass cheeks when on the bottom, not putting your hands on the ground when you are in someones guard (as opposed to controlling part of their body, not letting your opponent control your wrists, sleeves, collar, hips, or head, etc. all make you "tougher" and give you opportunity to apply the "moves".
I think Saulo Ribeiro's book is good resource, as good as any book can be on the subject, and is worth the money. I remember watching a video with good material on defensive postures, but I am blanking on the name.
Congratulations on training outside of your comfort zone/experience.