There is a wide range of online casino welcome bonuses available, and below are some of the most popular ones:

DEPOSIT BONUS
When you make your initial deposit at a casino, you receive a bonus based on the deposited amount. The bonus requires a minimum deposit, usually around €10 to €20 or equivalent currency. Before withdrawing bonus winnings, specific conditions must be met. Additionally, you might receive further deposit bonuses later, such as reload bonuses, birthday bonuses, or temporary promotions.

MATCH BONUS
This is a commonly offered bonus type where casinos advertise a certain amount of free money. However, it's not entirely free since you need to deposit a minimum amount, and the bonus amount depends on the deposit match percentage. For instance, with a 100% cash match and a €100 deposit, you'll have €200 to play with. The deposit match bonuses can vary from 100% to as high as 600%.

STAGGERED CASH MATCH BONUS
This type offers a higher percentage match for higher deposit amounts. If you deposit €50, you might get a 50% match bonus, but with a €100 deposit, the match bonus could be 100% or more.

MAKE YOUR OWN BONUS
Less common but still available, this bonus doesn't solely depend on the deposit amount. The casino gifts you with credit to play within a specific timeframe, and you get to keep your winnings as your welcome bonus. In case you don't win, some casinos may offer consolation prizes.

NO DEPOSIT BONUS
Certain online casinos provide a free bonus without requiring any deposit. To claim this bonus, you only need to create a new casino account, sometimes using a bonus code. The no deposit bonuses can range from £/$/€ 5 to £/$/€ 20, depending on the offer, and can be used on selected slots and table games.

FREE SPINS BONUS
Almost all casino bonuses include free spins, ranging from 10 to 500 spins, depending on the offer. Sometimes these spins are given out over several days. Usually, you need to make a cash deposit to receive this bonus, and winnings from free spins are subject to wagering requirements.

MOBILE BONUS
Some casinos offer mobile-specific welcome bonuses to encourage players to use their mobile phones for gaming. This allows players to enjoy bonuses while playing on-the-go.

Wagering Requirements: Welcome bonuses often come with wagering requirements, which means players must wager the bonus amount and sometimes the deposit amount a certain number of times before they can withdraw any winnings. These requirements can be challenging to meet.

Restricted Games: Some welcome bonuses may restrict the games you can play with the bonus funds, limiting the variety of games available to explore.

Time Limits: Welcome bonuses typically have time limits within which players must use the bonus funds. If the funds are not utilized within the specified timeframe, they may expire, and players lose the opportunity to benefit from the bonus fully.

Terms and Conditions: Welcome bonuses are subject to specific terms and conditions that players must understand. Failure to adhere to these terms may lead to the forfeiture of bonus funds and any associated winnings.

Risk of Overplaying: While welcome bonuses provide additional funds, they may also lead to the risk of overplaying and exceeding one's intended budget, especially if players get caught up in chasing bonus-related winnings.