When u hear/read a coin have a burning plan in their roadmap - is it a always buy in before and sell when it happen? ( Excluded shitcoins).
The essence of burning a coin or token is to reduce the supply which in turn will make it more profitable but it highly depends on the coin or token in question. Before now, most projects always burn their token and it kind of became a thing which is used to drive hype, and although it worked for the meantime but later on it doesn't move investors again because even shitcoins are also burning theirs just to pump price. So nowadays, burning plan doesn't drive price again, it's now seen as a normal project plan, unless it is a coin whose team already have good products and services in place, thus with burning which reduces the supply, it will in turn lead to more value of the project's coin or token.
A good example is the ETH London hard fork, ETH is already a valuable coin, and with the upgrade leading to burning of ETH coin, the price will continue being attractive. Another example is BNB coin, the platform always have a burning plan which was started a long time ago, and it has in a way contributed to the good price of BNB we see today. But you see for most shitcoins, the team only announce burning plan to drive hype, pump the price and possibly dump it on investors.