Plenty of reading out there. I would certainly recommend doing...

Plenty of reading out there. I would certainly recommend doing some - although the "longer term" you are, the less you are affected.

Heres a piece ...

3. Spoofing The Tape
 Spoofing, also known as layering, the tape is when sophisticated short-term investors place orders in the market with no intention of having them filled. Other investors see the large orders waiting to be executed, believing that a market whale is trying to buy or sell at a certain price. Therefore, the investor places their order at the same level to buy or sell.Seconds before the market trades at the price of the large order, the order is pulled from the market, and the retail investor's order is filled. After the spoofer pulls the order, the market drops, resulting in losses for anyone unfortunate enough to be tricked into buying.Avoiding short-term trading is the best way to protect yourself from spoofing manipulation. If you do short-term trading, over time you will learn what spoofing looks like, and thus be able to capture profits along with the spoofer. However, this type of trading is only for the most sophisticated and skilled investors.
4. Wash Trading
 This tricky form of manipulation is when a big player buys and sells the same security continually and nearly instantaneously. The rapid buying and selling pumps up the volume in the stock, attracting investors who are fooled by the spiking volume. Once again, this form of manipulation does not affect long-term investors.
5. Bear Raiding
 Bear raiding is when a large player forces share prices lower by placing large sell orders. The price plunges as stops are hit, adding to the selling.

From here....https://www.nasdaq.com/article/5-market-manipulation-tactics-and-how-to-avoid-them-cm946807

There is a lot more in depth stuff out there.

Significant Movements and Holders lists suggest that currently there is one trading house trading volumes of Nuheara shares that have the power to "direct" the market.