Tutorial for Plugin Development ..

I need to develop a plugin for one of my clients, which has an options page as well. Can any person point me to a link where I can find a useful information about how to proceed? The one’s I have come across are I think outdated and not relevant to the current versions v3+.
I will appreciate if someone can share a piece of code consisting of kind of a template which I can use by changing the input fields only for all my future needs.:), if the template is based upon a table based structure will be really fantastic.
TIA