"Please read many books."
It works now, but I am curious, is there any grammatical difference? Like [many books] [please read] vs [books] [please read a lot]?
Yomu turns into yonde in te form. te form enables you to create a request or comand by adding kudasai (please). http://www.sljfaq.org/afaq/te-form.html gives a rundown on te form which should help you understand. Read also about Ru and U forms of verbs which you may also not know from learning on this website on this web page https://www.wasabi-jpn.com/japanese-grammar/japanese-verbs-u-verbs-and-ru-verbs-and-conjugation/
I'm guessing that, like the 'te' in other request sentences, it marks a request from the speaker. Can someone more fluent please confirm this?