as a beginner I choose these 5 IT companies TCS INFOSYS HCL TECH TECH MAHINDRA and L and T infotech. Is this a good decision

Is IT the industry to invest in at this point in time and what are the prospects of the industry at this point of time?

You must be aware that the IT industry is largely dependent on the growth in the US markets and the strength of the dollar (weakness of the rupee). Donald Trump has not been too open to the Indian IT companies taking away local jobs and that will be an overhang.

Broadly, IT companies are compared on three factors viz. sales/profit growth, number of premium clients and share of digital revenues. Among the five companies above, only TCS and Infosys have most of these factors in their favor.

You must be aware that in the 2019 budget, the government has effectively imposed a tax on buyback of shares. These IT companies typically cash-rich companies that have been using buybacks to reward their shareholders. That may not be the case any longer. Also, the Budget has announced a possible increase in public shareholding of all listed Indian companies from 25% to 35%. If that happens then companies like TCS will have to sell a large part of the promoter holding in the market. This will increase the free float and depress the prices.

Lastly, if you buy the above stocks, all of them will almost move in tandem most of the time. You have a simpler option of buying a Technology Mutual Fund and automatically get a portfolio of diversified IT stocks.

Ideally, for starters, it is better to start off with diversified funds than putting all your money in just one sector. Think about these five points before making a final decision.