I would not advise someone to invest in Bitcoin when they don't know when to buy and when the market is overbought and about to dip.
This basic knowledge is important for us to understand the market behavior and determine how we are going to trade in the market. This just a shallow knowledge about the market.
Buying the is more of a method of buying BTC but this only works for BTC . Despite, all the advice dudes still want to get their hand on altcoins even if it's just 10% of your holdings, altcoins don't work that way and buying their dips could be very bad .
Besides, after accumulating alot of btcs the need of trading little out of your holdings to buy more btcs will arise and then u will still have to work your as to learning what you are running from.