Re: do i have to download all blocks to start using my bitcoin

Any full wallet really.
But Bitcoin is really the slowest one to sync from the start as it has a lot of transactions and is the oldest.

True, just use a blockchain.info wallet, no need for download of the block chain.

but the online wallet not 100% safe.

Its not 100% safe but its pretty secure and hasnt had any real problems. Do not use an exchange to hold your coins, ever.

I use blockchain.info as my online wallet. I have a Yubi Key as a 2-factor authenticator so its pretty safe.

even if it is safe from hackers, its not safe from the company running blockchain to go bankrupt and close the website

True. The only safe wallet is your own personal wallet that you have the keys too, and that system that holds the keys is not connected to the internet at all.