It's definitely possible. Bilinguar books are, as already mentioned, a great thing. If French and Spanish are amongst them, I can really recommend Assimil.
The founder of Lingq, Steve Kaufmann, once recommended to have similar languages on a different language level, which I totally agree on. My Italian is quite good so it was easier to start French due to the similarities but since one language was so much more engrained into my brain I wouldn't get confused so much with forms and words. Now I'm adding Spanish. In the beginning I tried to start the two simultaniously but that sometimes led to mixing things up. With the other two languages rather settled I can now focus more on how each language writes and builds words to learn them easier.
Furthermore, if you're learning French, Spanish, German and Italian this dictionary can be quite helpful (if you're studying other languages, too, you can also add those languages the specific meanings to add some more comparisons)
Hi trueadwoman. Whilst I had my doubts about this first as well, after over a year experience with Preply I actually disagree there with you. In the end it is up to you to decide whether to work on these terms and go via Preply or not. At the same time Preply is also offering a great service in as much as connecting you with potential language speakers - I see the percentage they take as reimbursement for their service. (From a tutor perspective specifically: For the times when I don't accept any new students for example I hide my profile - so I will only ever do trial lessons when I am accepting new students, which happens quite rarely. Many students have stayed on for a year or longer. So one trial lesson really goes a long way in my experience. :-) Check this out if you change your mind: https://preply.com/?pref=MTMwMTQzNg==
Seconded. Language Transfer is the best resource I've found for grammar learning since I got serious about languages 4/5 years ago. I adore it!!!!!! Combine it with Duolingo, and this course --> https://www.memrise.com/course/114794/spanish-duolingo/ and you're in for a winner.
I tried this "book," because it was cheap and I'm open to learning something new. Although the strategy presented here seems valid, it's just that, an overview of a strategy. At only 16 pages, I felt like I was reading a eHow.com article. I was disappointed. ... However, while looking for polyglot insights, I found a great value, with even more insights in this other book with a similar price: The Secrets of Polyglots by Konrad Jerzak vel Dobosz https://www.amazon.com/dp/8362402539/ref=cm_sw_r_cp_apa_glt_fabc_Z1Z8EJ4H03CFBPX1J7FA
Yes!! I am using "The First Hebrew Primer": The Adult Beginner's Path to Biblical Hebrew. You can find it here. https://www.amazon.com/First-Hebrew-Primer-Beginners-Biblical/dp/0939144158
There is an Answer book and flashcard set that you can get to go with the book as well. I love it so far!
Mandarin?! Wow, lucky guy! I'm learning Cantonese. There are tons of resources for Mandarin!
Oh boy have I got the motherload for you!
HelloChinese, ChineseSkill, Anki2InkStone, Skritter, Helsig (I use with physical flashcards), ChinesePod, TheChairmanBao, YouKu, Glossika, Nanchanese, CharacterPop, https://play.google.com/store/apps/details?id=com.funnybean.mandarin (read graded text Manga) , Pandarow.
I think the best starting point is probably ChinesePod.
I'm pretty jealous as I can't use nearly all of this for Cantonese.
Try efficient SRS flashcard tools like the Beginner Japanese app to learn the basic Japanese words from scratch. I understand that they have Beginner apps for Chinese, Ainu, Esperanto, Welsh and even Dzhongka too.
I am using Memrise and Duolingo, books in italian, movies, tv shows, podcasts, an app called tandem to speak with italian natives and I just bought myself the book Italian with Elisa: A multimedia language course for the world which I'm going to pick um from the post in about 5 minutes.
Also if you absolutely want to go get classes, I'm sure there's at least one place where they give Italian classes or even a private professor.
Edit: Also youtubers, I follow Lucrezia which posts interesting videos on YouTube and also I follow her on Instagram so I get a daily dose of italian from her stories, posts, etc...