I've got a Lenovo laptop with Win 10 and other data on HDD. Can i replace it with SSD not loosing the license for Win 10

Yes you can, the licence is tied to the laptop hardware not the hard drive, and the activation details are stored on Microsoft servers. Either clone the HDD to the SSD or do a clean install of W10, either way it will activate successfully once you get an active Internet connection.

Yes, you can

Yes you can. The license is tied to your motherboard not on your disk drive. Unless you change your motherboard, it should be okay

You can change a disk in any pc and re-install windows 10 and you don't need a new licence. Your current licence is held at microssoft.com and includes a licence number and the Digital ID of your mainboard. So you can safely CLONE the drive or just re-install W10 on the new drive. But you must also realise that a 3rd item is stored at microsoft, and that is the OS install history. So if your pc originally came with w7 or w8 and you applied the w10 UPGRADE OS, then you must do the same to any new drive. You do that one of two ways. 1) you simply CLONE the drive(duplicate it from the original) 2) insert a blank drive, install original OS, then install and apply UPGRADE OS. If your current OS is the original, then just CLONE the drive which will then include boot code and any RECOVERY partition, and you can then even RESET the pc using the new disk so that its a clean install. *** so you don't loose the licence just because you want to change the disk ****