Hello, I am new here. What is the best way to get all transactions from a wallet? And save them?

download tonkeeper, import the seed phrase and see the transaction history

No, I would like to see the history of a given wallet and save it.

export history?

History of a wallet transactions.

in what format?

CSV, JSON, HTML

you can get in json format the transactions of the wallet, if it has less than 100 transactions, at https://toncenter.com/api/v2/getTransactions?address=&limit=100&to_lt=0

Thank you. It seems nice, I think it is not possible to go over 100 with a free tier. Right?

you can change the to_lt digit from 0 to 100, etc., but you can't get more than 100 at a time.

*lt is not the index of transaction and needs to be changed according to last seen lt.

ah, yes. it should be possible to view the last digit of lt

If this is the only way with big limit, why does the explorers do not allow to export the data?

Because it's not common request.

What is the best place to ask for this feature?

You should post this at https://github.com/ton-society/grants-and-bounties/issues.

why?

Because this looks as a worthwhile footstep.