They share an alphabet and a great deal of vocabulary, and they are not the same language to learn. Picking the wrong one costs you months.
If you want to speak to Israelis, order coffee, handle an appointment, understand your partner's family, or move to Israel, you want modern Hebrew. If you want to read the Torah in its original language and follow rabbinic commentary, you want biblical Hebrew.
Most people asking the question want the first one and are worried they are supposed to want the second. You are not. They are separate goals and they lead to different classrooms.
Neither is more legitimate than the other. But starting with the wrong one, then discovering months later that you still cannot ask where the bus stop is, is a genuinely common and avoidable waste.
Modern Hebrew was deliberately revived from the biblical and rabbinic language, so the connection is real and much of the core vocabulary carries over. Someone strong in one has a genuine head start in the other.
That is where the similarity stops being useful.
Grammar has moved. Biblical Hebrew uses verb forms and sentence patterns that modern speakers do not, and modern Hebrew has settled into structures that biblical Hebrew never had.
Vocabulary has exploded. The Bible had no word for computer, appointment, traffic or refrigerator. Modern Hebrew invented or borrowed thousands of words, and those are the words daily life is made of.
Register is completely different. Reading biblical Hebrew and then speaking it to an Israeli is like walking into a shop in London and addressing the cashier in the English of the King James Bible. You would be understood. You would also be memorable for the wrong reasons.
Someone who studied biblical Hebrew for two years can often read a verse and struggle to buy a bus ticket. Someone who learned modern Hebrew for six months can handle the bus, the shop and small talk, and will find a biblical verse heavy going. Both are normal. They trained for different things.
Here is the part that catches people who did choose modern Hebrew and still feel lost when they arrive.
Everyday Israeli Hebrew is full of slang, much of it borrowed from Arabic, Yiddish, English and army life. If you only ever learn textbook Hebrew, you will understand maybe 60% of what you actually hear.
None of the following will be in a formal course, and you will hear all of them on your first day:
That last one is a good illustration of why exposure matters more than memorising. The literal meaning is the opposite of the usual meaning, and only hearing it used teaches you the difference.
Choose modern Hebrew if you are planning Aliyah or a long stay, you have Israeli family or a partner, you want to talk to people, you want to follow Israeli news or television, or you simply want the version of Hebrew that is alive and spoken by nine million people.
Choose biblical Hebrew if your goal is the text itself. Reading Torah in the original, following commentary, academic or religious study. It is a serious and rewarding pursuit and it is a reading skill rather than a speaking one.
If you want both, most people are better served starting with modern. You get the alphabet, core vocabulary and the habit of reading without vowels, and those transfer. Going the other way is harder, because biblical study does not build the speaking reflexes or the modern vocabulary at all.
Modern, colloquial Israeli Hebrew. No nikud, no biblical register, and the slang included rather than left out, because that is what people actually speak. If your goal is the biblical text, we are not the right school and I will tell you so on the call.
The road from here is shorter than most people expect.
The alphabet takes two to three weeks and is the same either way, so nothing is wasted while you decide. Here is what learning it actually involves, including the letters that cause lasting spelling mistakes.
After that, most complete beginners hold a basic conversation within two to three months of weekly lessons, and comfortable fluency takes a year or more. The full timeline is here, month by month.
The single thing that separates people who get there from people who stall is not talent or age. It is whether anyone is correcting them while they speak.
One trial lesson is usually enough to work it out. Tell me what you want to be able to do, and I will tell you which Hebrew gets you there and roughly how long it takes.
A full 50 minutes, one to one, for $55. No subscription and nothing that renews, and if what you want is the biblical text, I will point you elsewhere rather than sell you lessons.