haraam money

Q: My questions are regarding haram earnings and investing it in education. I have learnt that investing haram money in a halal business is haram, and any remuneration is impermissible. This is what I understand.

1. If someone invests haram money in education by purchasing a course(s) that are permissible to study like language, science etc. and then they go on to study a degree also bought with haram earnings, will the knowledge that they acquire be permissible for them to use?

2. What is the status of the certificates and/or degree gained? Are these things haram for one who acquired them to keep or show employers?

3. And if he goes onto use this knowledge in a profession like medicine, teaching, engineering etc. will his earnings be haram? For example, he studies GCSE's, A-Levels, then goes onto study a degree in physics and then becomes a physics teacher after qualifying; will his earnings be haram after he spent haram earnings on all his previous courses?

Q: How to get rid of haraam money? Should I give this money to poor or needy relatives?

Q: I want to know that is the profit made through halaal business that was initially started by haraam money is halaal or haraam to use. Example: If I use haraam money and start a halaal business and I earn some profits from that business so that profit is halaal or haraam? Please let me know the Islamic rulings about this issue.