Investing Basics – Feel free to ask the most basic questions

Hello all,
I have a query after looking at performance of companies like RACL, SBCL, AngelOne ,MapMyIndia etc.

What should be the approach for a new investor when looking at companies with good result? Because these companies are in growth phase or already grown a lot, there valuation will always be on expensive side. What option does retail investor have in such scenarios? Does one wait for the correction in these companies or simply ignore these one and look for newer options. ?

This is not from a point of FOMO but when you encounter companies with good recent past record this question can be natural.

Thanks