Hello, some advice: in general, it is better to post separate messages for different questions. That allows those that have an interested in a specific aspect of org/emacs to follow and interact. It also helps to have a subject line then that describes briefly the topic of the question.
> - oh, wait. I have an old PC I don't use much (2008 AD -Core 2 Duo). I > was thinking about using it just for orgmode. Would you recommend me > an OS? I run Emacs with org on a little palmtop (well, 2 of them) with Linux so a Core 2 Duo from 2008 is more than enough if using Linux. The key constraint will be memory, with 1 GB being the minimum practical amount these days in my experience although less can be okay if you're careful. HTH, eric -- : Eric S Fraga via Emacs 28.0.50, Org release_9.4.6-577-gf76d4d : Latest paper written in org: https://arxiv.org/abs/2106.05096
