Free Modern Hebrew Grammar pdf
שלום חברים! I think this resource could be very helpful... http://alexalejandre.com/language/Hebrew%20-%20Essential%20Grammar.pdf
Agree, they have annoying sound issues (since it's actual voice actors recording- so not everything is recorded). Still, as a native speaker I can tell you that if you manage everything shown on duolingo (with the help of other sources) you'll have a very solid base . It's a shame, there are enough native speakers who can help with the recording (but are not professional voice actors).
Well, it is! Hebrew is a hard language to grasp because it’s quite different from the Roman languages we are used to, but it is not impossible to learn Hebrew. Duolingo offers a good introduction to the language and if you stick to that and don’t give up you will have a basic command of Hebrew.
I have been on this course for slightly over a year and will likely finish the tree in two or three months. The first section is harder because everything is new. I knew the alphabet and a few other things but 80% of the vocabulary was new. I found it much easier to get motivated to continue once I finished the first and second checkpoints. Then there came a point where I had advanced too fast and I had to take a couple of months to review everything. But now it's a pleasure to look back and see how much I have learned. This is a great course to get you started in Hebrew.