Does it work the same with Bitcoin shares as well?
You need to know and remember that Bitcoin and shares are two very different things. Generally Bitcoin is generated from a computer system usually called "Blockchain", based on a supply and demand agreement. When you decide to buy Bitcoin, you will have digital money according to the amount of money you invested to buy Bitcoin. In general, both Bitcoin and stocks have movements that are not continuously flat. The assessment can go up or down which can be influenced by several factors. However, for cryptocurrencies, changes in value can occur suddenly and drastically without warning and are more volatile. Meanwhile, for shares, the rate of movement is considered slower depending on the performance and developments in issues related to the company in question.
BTC fluctuates and then there are transaction fees, so sometimes we may get a lesser money from what we use to buy a BTC but we shouldn't worry especially if we are here to invest/HODL, as it can only recover and can give us a good amounts of profit soon. It is possible to receive a warning if the price will go up or down because we have news that covers this and then we have software/tools and websites like this forum that always speculates the crypto movements.
Bitcoin shares on the other hand, must be the same with Bitcoin because we are talking about Bitcoin here, not any other company but it's just that someone might HODL it for us which can be and advantage or disadvantage depending on our personality.