The wisdom of those who have gone before is available in the posts that have gone before (but are still very easy to browse/search for in the travel forum).
Tips on your questions are here;
Visiting China from Taiwan
[Visiting China from Taiwan
Mainland China Visas
[Mainland China Visas
Multiple entry F visa to China from HK (a bit urgent, thanks
[Multiple entry F visa to China from HK (a bit urgent, thanks
[quote=“mymarkov”]…a quick post from you might help.[/quote]Browsing the forum yourself is even quicker than waiting for another quick post from people who posted the information you need only two weeks ago.