An amount that you think is sufficient to experience the new world of investing and your risk appetite. Remember not to invest at the cost of family responsibilities.

Let's go to NFT section.

For example: A monk made a vase and converted into three-dimensional virtual object being sold online first time (bought by Mr. X). Now that monk will get monetary benefit. Again, that NFT by monk owned by Mr. X sold to Mr. Y, in return that monk will be benefitted monetarily. So, it’s a continuous source of income for an artisan.

Let's go to metaverse section.

Some of major risks are as follows.
Get rich fast schemes, MLM, etc. using altcoins or tokens, investing after getting influenced by online news, chats and videos without knowledge and information, investing into something without sustainable road map for growth.
Remember, it is not quick get rich but, technology driven world that requires technology knowhow or assistance form such professionals.

Please, watch this video.

When you invest like any other investment there is no tax. However, when you withdraw the amount there is tax. Why not transact using (partial amount) and continue with investment for future of yourself and your family.

Anything if buyer and seller agrees to transact in cryptocurrency.

You can think it as a bond based on cryptocurrency backed by white paper stating the purpose for which that token is released.

Yes, but do not transact through unsecured and illegal means.