If you're viewing this from LinkedIn, you can access Nostr using the following client apps:
Android: Amethyst
iOS: Damus
Computer: Coracle
Simply download the app on your device. Generate a private key (nsec). And that's basically it.
Keep that private key PRIVATE, and secure. If you lose it, you lose your account forever. To login on other clients, simply punch in your private key.
To share your profile with others, you can post your PUBLIC key (npub). Don't mix the two up. I'm sure some other experts can suggest easier add/share methods but this way works. Enjoy!
My npub: npub1rr7vzwv4p2wvu0lwtmj0far08clsuvuzwlwv30xkj2euur55pp8qr9wudh