I recemtly started investing in Shares, my decisions are based on TV Analysis and co- worker suggestion. However i am skeptical about it. I do not feel contented about the way i invest my money . I have a few questions.
1, What determines the value of a stock. ( I think it’s demand ,and financial performance of the company does not really matter …Is that true.. )

2, Past Super mega performnace of a stock does not gurantee a level of security for the futur yeilds.How can we decide wether to invest in such stocks.

3, Are the TV guys really reliable. Becoz a lot of mnipulation can be done if the demand of a stock is huge ( I mean the dirty game )