As a beginner if you are starting to trade stock options selling few important points u can refer.

1. Trade only highly liquid stocks (list i have posted sometime back on my timeline).

2. First understand ur trading phychology and decide trading style (speads or naked)

3. Decide your position size ( for beginner max leverage should not be more than 2.5x would suggest prefer 2x)

Example : Trading with 20L capital

Then keep 50% capital free in begining.

Divide 50% capital into 4/5 stocks.

Divide stocks such that u ll have 20-25% diversification to single sector.

For example :

1 lot AXISBANK (BANKING)
1 lot INFY (IT)
1 lot m&m (Auto)
1 lot RIL (OMC & TELECOM)

This way chances of gaps in all stocks at once will get reduced.

Divide stocks as per 3 categories

Bullish
Bearish
Sideways

If market is bullish then keep 50-75% position bullish and 25-50% position sideways.

If market is sideways then keep 75% position sideways and keep rest 25% free which u can use if market takes directional move.

I personally avoid trading bearish market much as those moves will be very quick and big but bears won't stay for longer duration so in bear market i go on vacation & come back when bulls return.

If you follow this things mentioned u will rarely face blackswan events while trading stock options.

One good advice if you are trading non-directional positional then strangle is always better then straddle (easy to adjust).

Increase position size to 4x leverage once u get conviction into ur trading system.

Personally i avoid few sectors PHARMA, TELECOM & OMC (don't tell me RIL is telecom as well as OMC ).

Hopefully this will help to start as a beginner.