Reddit reviews Field Expedient SDR: Introduction to Software Defined Radio
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https://www.rtl-sdr.com/ is a great place to start. They also have a book that will cover much of the basics from the different radio's you can get, antennas, filters and a walk through of large amount of projects. If you want to go a bit deeper you should check out the book Field Expedient SDR: Introduction to Software Defined Radio. There are three books to that series.
As for your first SDR Nooelec NESDR Smartee bundle is a great start. Once you have an idea of what other projects you want to work on you can upgrade to something like LimeSDR (or mini) or a hackrf. I would recommend the LimeSDR Mini.