I do the same as Rubie, primarily use GoodRead to keep track of "to be read" books, sometimes my first post in here. I used to use my library's website sometimes too, but I haven't been going to the library lately, so I stopped using that.

Hm, I think I tried signing up for Goodreads a long time ago but found it too frustrating to figure out how to use properly.

I have a bunch of lists of books that were recommended to me at one point or another that I casually look for in used book stores, but it's gotten very long and I want to organize it properly somehow.

Hm.

Maybe I should look at Goodreads again?

Are there any good guides on how to set that up and use it properly?

Yes, I'd definitely recommend giving it another shot! You can keep track of everything you want to read, keep track of everything you've read, keep track of your reading goal for each year, rate books, see books that are similar to the books you like, enter giveaways for books, read reviews of books, create categories that you can put books into, etc. This is me: https://www.goodreads.com/user/show/5339113-pengaween

I do like GoodReads, specially reading other people's reviews.
I do write mine sometimes, when I feel like I have something to add.
And it's a nice way to keep track of what you've read all along a year, you can see your stats and all that stuff.
If you have friends there, you can see what they are reading and what they think of those books.
It's cool.

I used to have a list on goodreads that I would always pull up when I went into a bookstore to see if I can't find some of the books on it. I found that very helpful, but a lot of the times I wouldn't find the book for who knows why, but it was still helpful so I wouldn't accidentally purchase two of the same books. (I now take a picture of my bookshelves before I go book shopping if I am just going to pick up anything that sounds interesting and not on a mission for a certain book.)

I have a really bad memory, so I've been writing reviews on GoodReads just for my own benefit to remind myself why I did or didn't like things.

Sanssouci, I sent you a friend request at GR. If that's ok with you, accept it

My husband uses GR just the same way as you.
Actually some of his reviews include mere facts about the book, so he can remember what exactly the book was about.

Popping in to just update my reading progress, which is minimal. I actually read a few pages of that book I've been reading for two years now, lol. And I'm close to finishing a chapter. Cross your fingers for me

Accepted!

I'm currently reading a kids book called The Dancing Cats of Applesap.